grade 1: 90% 5-year survival Primary intraosseous hemangiomas are slow-growing vascular malformations, usually located in the medullary cavity. the endosteum) of bones, most typically long bones, due to slow-growing medullary lesions 1.. They are classified as osteoclastic giant cell-rich bone tumors 1,2. Hereditary multiple exostoses/osteochondromas, also known as diaphyseal aclasis, osteochondromatosis, or simply multiple osteochondromas is an autosomal dominant condition, characterized by the development of multiple osteochondromas. Epidemiology. chondroid lesions (e.g. Epidemiology. Diagnosis This type of calcification may be seen in many radiological settings including 1:. In general: grade. Mnemonics for the differential diagnosis of lucent/lytic bone lesions include:. FEGNOMASHIC; FOG MACHINES; They are anagrams of each other and therefore include the same components. In general: grade. Primary intraosseous hemangiomas are slow-growing vascular malformations, usually located in the medullary cavity. UBCs are usually found in children in the 1st and 2nd decades (65% in teenagers) with the mean age at diagnosis being 9 years 8.. Pathology. Enostoses, also known as bone islands, are common benign sclerotic bone lesions that usually represent incidental findings. chondroid lesions (e.g. Epidemiology. Fibrous dysplasia (FD) is a developmental benign medullary fibro-osseous process characterized by the failure to form mature lamellar bone and arrest as woven bone that can be multifocal. Osteosarcomas are malignant bone-forming tumors.. See enchondroma vs low-grade chondrosarcoma. There are a bewildering number of bone tumors with a wide variety of radiological appearances. Bone infarction is a result of ischemia, UBCs are usually found in children in the 1st and 2nd decades (65% in teenagers) with the mean age at diagnosis being 9 years 8.. The diagnosis of chondroblastomas is based on a combination of typical radiological and pathological features 1. Nuclear medicine. McCune-Albright syndrome (MAS) (also known as McCune-Albright-Sternberg syndrome) is a genetic disorder characterized by the association of:. Treatment and prognosis. Aneurysmal bone cysts are rare. Diagnosis Intense uptake occurs with an underlying pathological fracture or cortical expansion in small bones 5. Epidemiology. Skull vault osteomas are benign primary bone lesions that are commonly incidentally discovered. It covers a vast array of bone lesions and provides you with key tips to assist your radiographic interpretation and differential diagnosis. This learning pathway combines a series of video lectures and original illustrations by MSK radiologist Matt Skalski with notes, cases and quizzes by Andrew Dixon ().). Pathology. In those with the condition, the arms and legs are short, while the torso is typically of normal length. On imaging, BPOPs are shown to be continuous with the underlying cortex, but usually without continuation of the medulla. endocrinopathy: precocious puberty; polyostotic fibrous dysplasia: more severe than in sporadic cases cutaneous pigmentation: coast of Maine 'caf au lait' spots In general: grade. Clinical presentation Secondary osteosarcoma occurs in the elderly, usually secondary to malignant degeneration of Paget This type of calcification may be seen in many radiological settings including 1:. There is a slight male predominance. Liposclerosing myxofibrous tumors can occur in a wide age range with a peak in the 4 th decade of life 2-4.Men and women seem to be equally For a formal and updated classification of bone tumors, see WHO classification of tumors of bone. The etiology and pathogenesis are unknown 4.Most commonly they are located in the vertebrae (of the thoracic spine 5), followed by the skull and facial bones, followed by long bones where they preferentially involve the metaphysis or Epidemiology Osteomas are more common in middle-aged men 1,3. Ewing sarcomas are the second most common malignant primary bone tumors of childhood after osteosarcoma, typically arising from the medullary cavity with the invasion of the Haversian system.Ewing sarcomas usually present as moth-eaten, destructive, and permeative lucent lesions in the shaft of long bones, with a large soft tissue component and typical onion They are classified as osteoclastic giant cell-rich bone tumors 1,2. Ewing sarcomas are the second most common malignant primary bone tumors of childhood after osteosarcoma, typically arising from the medullary cavity with the invasion of the Haversian system.Ewing sarcomas usually present as moth-eaten, destructive, and permeative lucent lesions in the shaft of long bones, with a large soft tissue component and typical onion Epidemiology. Osteomas are commonly found in patients undergoing imaging of the sinuses, appearing in up to 3% of CT examinations of the paranasal sinuses 1.They are most frequently diagnosed in 20-50 years olds, and there is a male predilection (M:F = 1.5-2.6:1) 1. Achondroplasia is a genetic disorder with an autosomal dominant pattern of inheritance whose primary feature is dwarfism. McCune-Albright syndrome (MAS) (also known as McCune-Albright-Sternberg syndrome) is a genetic disorder characterized by the association of:. It is the most common primary malignant bone neoplasm in adults. grade 1: 90% 5-year survival Achondroplasia is a genetic disorder with an autosomal dominant pattern of inheritance whose primary feature is dwarfism. The etiology and pathogenesis are unknown 4.Most commonly they are located in the vertebrae (of the thoracic spine 5), followed by the skull and facial bones, followed by long bones where they preferentially involve the metaphysis or FEGNOMASHIC; FOG MACHINES; They are anagrams of each other and therefore include the same components. Bizarre parosteal osteochondromatous proliferations (BPOP), also known as Nora lesions, are benign exophytic osteochondral lesions which have an appearance similar to an osteochondroma and are typically seen in the hands and feet. Lytic bone (osteolytic) metastases are distant tumor deposits of a primary tumor within bone characterized by a loss of bone with the destruction of the bone matrix. the endosteum) of bones, most typically long bones, due to slow-growing medullary lesions 1.. This learning pathway combines a series of video lectures and original illustrations by MSK radiologist Matt Skalski with notes, cases and quizzes by Andrew Dixon ().). Diagnosis. Prognosis varies with both grade and location. Epidemiology It is the second most common type of juxtacortical or surface osteosarcoma after parosteal osteosarcoma and accounts for 1.5% of all osteosarcoma cases. They are by no means exhaustive lists, but are a good start for remembering a differential for a lucent/lytic bone lesion and will suffice for >95% of the time 1.. Mnemonics Epidemiology Osteomas are more common in middle-aged men 1,3. Systematic review Choosing a search strategy and utilizing it consistently is a helpful method to overcome common errors seen in diagnostic radiology. It can affect any bone and occur in a monostotic form involving only one bone or a polyostotic form involving multiple bones. Diagnosis. Multiple myeloma, also known as plasma cell myeloma, is a multifocal proliferation of plasma cells based in the bone marrow.. Osteochondromas are a relatively common imaging finding, accounting for 10-15% of all bone tumors and ~35% of all benign bone tumors. enchondroma, chondrosarcoma) fibrous dysplasia Mnemonics for the differential diagnosis of lucent/lytic bone lesions include:. Increased uptake on the bone scan can be seen with enchondromas. Clinical presentation Periosteal osteosarcoma is a form of surface osteosarcoma. Differentiation of an enchondroma from low-grade chondrosarcoma is problematic, as they can have similar appearances. Enostoses, also known as bone islands, are common benign sclerotic bone lesions that usually represent incidental findings. Bizarre parosteal osteochondromatous proliferations (BPOP), also known as Nora lesions, are benign exophytic osteochondral lesions which have an appearance similar to an osteochondroma and are typically seen in the hands and feet. Although usually thought of as a benign bone tumor, they may be thought of as a developmental anomaly. Differentiation of an enchondroma from low-grade chondrosarcoma is problematic, as they can have similar appearances. In those with the condition, the arms and legs are short, while the torso is typically of normal length. Fibrous dysplasia (FD) is a developmental benign medullary fibro-osseous process characterized by the failure to form mature lamellar bone and arrest as woven bone that can be multifocal. Langerhans cell histiocytosis (LCH) is a rare multisystem disease with a wide and heterogeneous clinical spectrum and variable extent of involvement. McCune-Albright syndrome (MAS) (also known as McCune-Albright-Sternberg syndrome) is a genetic disorder characterized by the association of:. They are more common in males (M:F ~ 2-3:1) 2,6.Active unicameral bone cysts occur most frequently between the ages of 1 and 10 years. Maffucci syndrome is a congenital nonhereditary mesodermal dysplasia characterized by multiple enchondromas with soft-tissue venous malformations and/or spindle-cell hemangiomas 6,7, generally caused by somatic mutations in IDH1 or IDH2 6.. On imaging, it is usually portrayed by a short limb with metaphyseal distortions due to multiple enchondromas, They are more common in males (M:F ~ 2-3:1) 2,6.Active unicameral bone cysts occur most frequently between the ages of 1 and 10 years. Osteomas are benign mature bony growths, seen almost exclusively in bones formed in membrane (e.g. Osteofibrous dysplasia is considered as a separate pathological entity in view of its different presentation and treatment, although histopathologically similar to ossifying fibroma. This is useful in helping to distinguish low-grade chondrosarcoma from an enchondroma as the latter has increased uptake in ~20% of cases, and usually to a lesser degree (see: enchondroma vs low grade chondrosarcoma). The diagnosis of chondroblastomas is based on a combination of typical radiological and pathological features 1. enchondroma, chondrosarcoma) fibrous dysplasia Osteomas are commonly found in patients undergoing imaging of the sinuses, appearing in up to 3% of CT examinations of the paranasal sinuses 1.They are most frequently diagnosed in 20-50 years olds, and there is a male predilection (M:F = 1.5-2.6:1) 1. Nuclear medicine. Primary osteosarcoma typically occurs in young patients (10-20 years) with 75% taking place before the age of 20 because the growth centres of the bone are more active during puberty/adolescence 3. Chondroblastomas represent <1% of all primary bone tumors 1,2 occurring predominantly in the immature skeleton of young patients in the second and early third decade (10-25 years) with an overall male predilection 1-3.. Skull vault osteomas are benign primary bone lesions that are commonly incidentally discovered. Popcorn calcification refers to amorphous calcifications often with rings and arcs that resemble popped corn kernels. Epidemiology. skull). Osteomas are benign mature bony growths, seen almost exclusively in bones formed in membrane (e.g. Osteomas are benign mature bony growths, seen almost exclusively in bones formed in membrane (e.g. Terminology. On imaging, BPOPs are shown to be continuous with the underlying cortex, but usually without continuation of the medulla. In those with the condition, the arms and legs are short, while the torso is typically of normal length. The etiology and pathogenesis are unknown 4.Most commonly they are located in the vertebrae (of the thoracic spine 5), followed by the skull and facial bones, followed by long bones where they preferentially involve the metaphysis or Enostoses, also known as bone islands, are common benign sclerotic bone lesions that usually represent incidental findings. Multiple myeloma, also known as plasma cell myeloma, is a multifocal proliferation of plasma cells based in the bone marrow.. Terminology. Necrosis is a type of cell death due to irreversible cell injury, which can be recognized microscopically by alterations in the cytoplasm (becomes eosinophilic) and in the nucleus (swelling, pyknosis, karyorrhexis, karyolysis). Epidemiology As with all rare lesions, reported epidemiology varies: age: most commonly diagnosed before 30 years of age (~75%), mostly during second and third decades 1,12-15; full reported range from 3 to 70 years of age The terms 'giant cell reparative granuloma of small bone' 2,3 or 'giant cell lesion of small bone' have been discouraged 1. skull). Lytic bone (osteolytic) metastases are distant tumor deposits of a primary tumor within bone characterized by a loss of bone with the destruction of the bone matrix. See enchondroma vs low-grade chondrosarcoma. Secondary osteosarcoma occurs in the elderly, usually secondary to malignant degeneration of Paget Epidemiology. There are a bewildering number of bone tumors with a wide variety of radiological appearances. Popcorn calcification refers to amorphous calcifications often with rings and arcs that resemble popped corn kernels. Bone metastases are the most common malignancy of bone of which sclerotic bone metastases are less common than lytic bone metastases.. Terminology Langerhans cell histiocytosis was previously known as histiocytosis X. Primary intraosseous hemangiomas are slow-growing vascular malformations, usually located in the medullary cavity. Ossifying fibromas are benign bone lesions that should be differentiated from non-ossifying fibromas and fibrous dysplasia. Primary osteosarcoma typically occurs in young patients (10-20 years) with 75% taking place before the age of 20 because the growth centres of the bone are more active during puberty/adolescence 3. Describing a bone lesion is an essential skill for the radiologist, used to form an accurate differential diagnosis for neoplastic entities, and occasionally non-neoplastic.In addition to patient demographics, the radiographic features of a bone lesion are often the primary determinant of non-histological diagnosis. grade 1: 90% 5-year survival Epidemiology. Aneurysmal bone cysts are rare. They constitute a small focus of compact bone within cancellous bone. Diagnosis Hand radiographs are commonplace in the Emergency Department or the trauma reporting list. Those affected have an average adult height of 131 centimetres (4 ft 4 in) for males and 123 centimetres (4 ft) for females. Osteosarcomas are malignant bone-forming tumors.. They are more common in males (M:F ~ 2-3:1) 2,6.Active unicameral bone cysts occur most frequently between the ages of 1 and 10 years. They are less common than paranasal sinus or mandibular osteomas. Terminology Langerhans cell histiocytosis was previously known as histiocytosis X. They constitute a small focus of compact bone within cancellous bone. It is the most common primary malignant bone neoplasm in adults. Terminology. Maffucci syndrome is a congenital nonhereditary mesodermal dysplasia characterized by multiple enchondromas with soft-tissue venous malformations and/or spindle-cell hemangiomas 6,7, generally caused by somatic mutations in IDH1 or IDH2 6.. On imaging, it is usually portrayed by a short limb with metaphyseal distortions due to multiple enchondromas, Skull vault osteomas are benign primary bone lesions that are commonly incidentally discovered. Fibrous dysplasia (FD) is a developmental benign medullary fibro-osseous process characterized by the failure to form mature lamellar bone and arrest as woven bone that can be multifocal. Those affected have an average adult height of 131 centimetres (4 ft 4 in) for males and 123 centimetres (4 ft) for females. Epidemiology It is the second most common type of juxtacortical or surface osteosarcoma after parosteal osteosarcoma and accounts for 1.5% of all osteosarcoma cases. Osteofibrous dysplasia is considered as a separate pathological entity in view of its different presentation and treatment, although histopathologically similar to ossifying fibroma. Necrosis is a type of cell death due to irreversible cell injury, which can be recognized microscopically by alterations in the cytoplasm (becomes eosinophilic) and in the nucleus (swelling, pyknosis, karyorrhexis, karyolysis). Bone infarction is a term used to refer to osteonecrosis within the metaphysis or diaphysis of a bone. Epidemiology. Describing a bone lesion is an essential skill for the radiologist, used to form an accurate differential diagnosis for neoplastic entities, and occasionally non-neoplastic.In addition to patient demographics, the radiographic features of a bone lesion are often the primary determinant of non-histological diagnosis. Epidemiology. Systematic review Choosing a search strategy and utilizing it consistently is a helpful method to overcome common errors seen in diagnostic radiology. Necrosis is a type of cell death due to irreversible cell injury, which can be recognized microscopically by alterations in the cytoplasm (becomes eosinophilic) and in the nucleus (swelling, pyknosis, karyorrhexis, karyolysis). Increased uptake on the bone scan can be seen with enchondromas. Pathology. They are classified as osteoclastic giant cell-rich bone tumors 1,2. UBCs are usually found in children in the 1st and 2nd decades (65% in teenagers) with the mean age at diagnosis being 9 years 8.. There is a slight male predominance. skull). Secondary osteosarcoma occurs in the elderly, usually secondary to malignant degeneration of Paget Ewing sarcomas are the second most common malignant primary bone tumors of childhood after osteosarcoma, typically arising from the medullary cavity with the invasion of the Haversian system.Ewing sarcomas usually present as moth-eaten, destructive, and permeative lucent lesions in the shaft of long bones, with a large soft tissue component and typical onion It is important to note that although it is evidence of a slow non-infiltrative lesion, it does not equate to benign etiology. Differentiation of an enchondroma from low-grade chondrosarcoma is problematic, as they can have similar appearances. FEGNOMASHIC; FOG MACHINES; They are anagrams of each other and therefore include the same components. Periosteal osteosarcoma is a form of surface osteosarcoma. Hand radiographs are commonplace in the Emergency Department or the trauma reporting list. They constitute a small focus of compact bone within cancellous bone. Aneurysmal bone cysts are rare. The terms 'giant cell reparative granuloma of small bone' 2,3 or 'giant cell lesion of small bone' have been discouraged 1. They are the second most common primary bone tumor after multiple myeloma, accounting for ~20% of all primary bone tumors.They can be classified into primary and secondary forms, as well as histologic types, of which conventional osteosarcoma is the most common. Epidemiology. They are less common than paranasal sinus or mandibular osteomas. It is important to note that although it is evidence of a slow non-infiltrative lesion, it does not equate to benign etiology. Although usually thought of as a benign bone tumor, they may be thought of as a developmental anomaly. the endosteum) of bones, most typically long bones, due to slow-growing medullary lesions 1.. endocrinopathy: precocious puberty; polyostotic fibrous dysplasia: more severe than in sporadic cases cutaneous pigmentation: coast of Maine 'caf au lait' spots Ossifying fibromas are benign bone lesions that should be differentiated from non-ossifying fibromas and fibrous dysplasia. Terminology. The terms 'giant cell reparative granuloma of small bone' 2,3 or 'giant cell lesion of small bone' have been discouraged 1. Epidemiology As with all rare lesions, reported epidemiology varies: age: most commonly diagnosed before 30 years of age (~75%), mostly during second and third decades 1,12-15; full reported range from 3 to 70 years of age Non-ossifying fibromas (NOF) are benign and generally self-limiting osteoclastic giant cell-rich bone tumors typically found in the metaphyses of long bones. Diagnosis. Epidemiology. endocrinopathy: precocious puberty; polyostotic fibrous dysplasia: more severe than in sporadic cases cutaneous pigmentation: coast of Maine 'caf au lait' spots Bone infarction is a result of ischemia, According to the WHO classification of soft tissue and bone tumors (5 th edition) the term "liposclerosing myxofibrous tumor" is no longer recommended and instead, fibrous dysplasia is preferred.. Systematic review Choosing a search strategy and utilizing it consistently is a helpful method to overcome common errors seen in diagnostic radiology. Osteochondromas are a relatively common imaging finding, accounting for 10-15% of all bone tumors and ~35% of all benign bone tumors. Epidemiology. Nuclear medicine. According to the WHO classification of soft tissue and bone tumors (5 th edition) the term "liposclerosing myxofibrous tumor" is no longer recommended and instead, fibrous dysplasia is preferred.. Bone infarction is a term used to refer to osteonecrosis within the metaphysis or diaphysis of a bone. Hereditary multiple exostoses/osteochondromas, also known as diaphyseal aclasis, osteochondromatosis, or simply multiple osteochondromas is an autosomal dominant condition, characterized by the development of multiple osteochondromas. Bone infarction is a term used to refer to osteonecrosis within the metaphysis or diaphysis of a bone. Bizarre parosteal osteochondromatous proliferations (BPOP), also known as Nora lesions, are benign exophytic osteochondral lesions which have an appearance similar to an osteochondroma and are typically seen in the hands and feet. They are by no means exhaustive lists, but are a good start for remembering a differential for a lucent/lytic bone lesion and will suffice for >95% of the time 1.. Mnemonics Epidemiology. On imaging, BPOPs are shown to be continuous with the underlying cortex, but usually without continuation of the medulla. Describing a bone lesion is an essential skill for the radiologist, used to form an accurate differential diagnosis for neoplastic entities, and occasionally non-neoplastic.In addition to patient demographics, the radiographic features of a bone lesion are often the primary determinant of non-histological diagnosis. According to the WHO classification of soft tissue and bone tumors (5 th edition) the term "liposclerosing myxofibrous tumor" is no longer recommended and instead, fibrous dysplasia is preferred.. There are a bewildering number of bone tumors with a wide variety of radiological appearances. enchondroma, chondrosarcoma) fibrous dysplasia Diagnosis. Endosteal scalloping refers to the focal resorption of the inner layer of the cortex (i.e. Epidemiology. Osteosarcomas are malignant bone-forming tumors.. Achondroplasia is a genetic disorder with an autosomal dominant pattern of inheritance whose primary feature is dwarfism. It is important to note that although it is evidence of a slow non-infiltrative lesion, it does not equate to benign etiology. It is the most common primary malignant bone neoplasm in adults. It covers a vast array of bone lesions and provides you with key tips to assist your radiographic interpretation and differential diagnosis. Osteofibrous dysplasia is considered as a separate pathological entity in view of its different presentation and treatment, although histopathologically similar to ossifying fibroma. Diagnosis. Non-ossifying fibromas (NOF) are benign and generally self-limiting osteoclastic giant cell-rich bone tumors typically found in the metaphyses of long bones. chondroid lesions (e.g. Treatment and prognosis. They are mostly seen in children and adolescents, with ~80% under the age of 20 years 2,3 but can occur at any age 1.Both genders are equally affected 1.. Epidemiology. Those affected have an average adult height of 131 centimetres (4 ft 4 in) for males and 123 centimetres (4 ft) for females. Clinical presentation Liposclerosing myxofibrous tumors can occur in a wide age range with a peak in the 4 th decade of life 2-4.Men and women seem to be equally Intense uptake occurs with an underlying pathological fracture or cortical expansion in small bones 5. This learning pathway combines a series of video lectures and original illustrations by MSK radiologist Matt Skalski with notes, cases and quizzes by Andrew Dixon ().). Epidemiology. Langerhans cell histiocytosis (LCH) is a rare multisystem disease with a wide and heterogeneous clinical spectrum and variable extent of involvement. Prognosis varies with both grade and location. Terminology Langerhans cell histiocytosis was previously known as histiocytosis X. Periosteal osteosarcoma is a form of surface osteosarcoma. This is useful in helping to distinguish low-grade chondrosarcoma from an enchondroma as the latter has increased uptake in ~20% of cases, and usually to a lesser degree (see: enchondroma vs low grade chondrosarcoma). Hereditary multiple exostoses/osteochondromas, also known as diaphyseal aclasis, osteochondromatosis, or simply multiple osteochondromas is an autosomal dominant condition, characterized by the development of multiple osteochondromas. This is useful in helping to distinguish low-grade chondrosarcoma from an enchondroma as the latter has increased uptake in ~20% of cases, and usually to a lesser degree (see: enchondroma vs low grade chondrosarcoma). There is a slight male predominance. They are mostly seen in children and adolescents, with ~80% under the age of 20 years 2,3 but can occur at any age 1.Both genders are equally affected 1.. Terminology. Bone metastases are the most common malignancy of bone of which sclerotic bone metastases are less common than lytic bone metastases.. They are less common than paranasal sinus or mandibular osteomas. Lytic bone (osteolytic) metastases are distant tumor deposits of a primary tumor within bone characterized by a loss of bone with the destruction of the bone matrix. Treatment and prognosis. Epidemiology. Chondroblastomas represent <1% of all primary bone tumors 1,2 occurring predominantly in the immature skeleton of young patients in the second and early third decade (10-25 years) with an overall male predilection 1-3.. Epidemiology As with all rare lesions, reported epidemiology varies: age: most commonly diagnosed before 30 years of age (~75%), mostly during second and third decades 1,12-15; full reported range from 3 to 70 years of age Endosteal scalloping refers to the focal resorption of the inner layer of the cortex (i.e. They are the second most common primary bone tumor after multiple myeloma, accounting for ~20% of all primary bone tumors.They can be classified into primary and secondary forms, as well as histologic types, of which conventional osteosarcoma is the most common. Endosteal scalloping refers to the focal resorption of the inner layer of the cortex (i.e. Epidemiology. Epidemiology Osteomas are more common in middle-aged men 1,3. Intense uptake occurs with an underlying pathological fracture or cortical expansion in small bones 5. It arises from red marrow due to the monoclonal proliferation of plasma cells and manifests in a wide range of radiographic abnormalities. They are the second most common primary bone tumor after multiple myeloma, accounting for ~20% of all primary bone tumors.They can be classified into primary and secondary forms, as well as histologic types, of which conventional osteosarcoma is the most common. They are by no means exhaustive lists, but are a good start for remembering a differential for a lucent/lytic bone lesion and will suffice for >95% of the time 1.. Mnemonics Hand radiographs are commonplace in the Emergency Department or the trauma reporting list. Although usually thought of as a benign bone tumor, they may be thought of as a developmental anomaly. Epidemiology It is the second most common type of juxtacortical or surface osteosarcoma after parosteal osteosarcoma and accounts for 1.5% of all osteosarcoma cases. Multiple myeloma, also known as plasma cell myeloma, is a multifocal proliferation of plasma cells based in the bone marrow.. It arises from red marrow due to the monoclonal proliferation of plasma cells and manifests in a wide range of radiographic abnormalities. The diagnosis is usually established by a combination of imaging and the known presence of a primary tumor that is associated with sclerotic bone metastases. For a formal and updated classification of bone tumors, see WHO classification of tumors of bone. The diagnosis is usually established by a combination of imaging and the known presence of a primary tumor that is associated with sclerotic bone metastases. For a formal and updated classification of bone tumors, see WHO classification of tumors of bone. Maffucci syndrome is a congenital nonhereditary mesodermal dysplasia characterized by multiple enchondromas with soft-tissue venous malformations and/or spindle-cell hemangiomas 6,7, generally caused by somatic mutations in IDH1 or IDH2 6.. On imaging, it is usually portrayed by a short limb with metaphyseal distortions due to multiple enchondromas, Bone metastases are the most common malignancy of bone of which sclerotic bone metastases are less common than lytic bone metastases.. Non-ossifying fibromas (NOF) are benign and generally self-limiting osteoclastic giant cell-rich bone tumors typically found in the metaphyses of long bones. It covers a vast array of bone lesions and provides you with key tips to assist your radiographic interpretation and differential diagnosis. It can affect any bone and occur in a monostotic form involving only one bone or a polyostotic form involving multiple bones. Langerhans cell histiocytosis (LCH) is a rare multisystem disease with a wide and heterogeneous clinical spectrum and variable extent of involvement. Mnemonics for the differential diagnosis of lucent/lytic bone lesions include:. Increased uptake on the bone scan can be seen with enchondromas. Primary osteosarcoma typically occurs in young patients (10-20 years) with 75% taking place before the age of 20 because the growth centres of the bone are more active during puberty/adolescence 3. Epidemiology. Bone infarction is a result of ischemia,