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Adjacent soft tissue abscess and sinus tract formation extending from the olecranon to the skin surface, consistent with chronic osteomyelitis.
Diffuse marrow edema in the proximal femur with cortical disruption and soft tissue abscess, consistent with acute osteomyelitis.
Edema and enhancement in the radial head, with evidence of cortical erosions and intramedullary necrosis.
Marrow signal alteration in the clavicle with cortical erosion and surrounding soft tissue edema.
Intraosseous abscess in the proximal ulna with surrounding marrow edema and cortical breach.
Marrow signal alteration in the clavicle with cortical erosion and surrounding soft tissue edema.
Chronic osteomyelitis with thickened periosteum and sclerosis in the proximal humeral metaphysis.
Adjacent soft tissue abscess and sinus tract formation extending from the olecranon to the skin surface, consistent with chronic osteomyelitis.
Periosteal reaction along the tarsal bones with diffuse marrow edema, indicative of spreading osteomyelitis.
Isolated Brodie’s abscess in the proximal femur with a well-defined rim and central necrosis.
Fredericson MRI classification of medial tibial stress syndrome
Grade III Fredericson MRI classification of medial tibial stress syndrome
Clear cell sarcoma in the distal humerus with high T2 signal, infiltrative borders, and extension into the adjacent muscle compartments.
Ewing sarcoma in the radial shaft with ill-defined margins, cortical destruction, and surrounding periosteal reaction.
Desmoid tumor in the supraspinatus fossa with well-defined margins, low T1 signal, and high T2 signal without central necrosis.
Synovial sarcoma in the plantar aspect of the foot with multi-lobulated appearance, heterogeneous T2 signal, and prominent perilesional edema.
Synovial sarcoma in the axillary region with heterogeneous signal and septal enhancement, showing invasion into the surrounding musculature.
Ewing sarcoma involving the calcaneus with permeative lytic destruction, cortical erosion, and a surrounding soft tissue mass.
Epithelioid hemangioendothelioma in the proximal humerus with small lytic lesions and mild soft tissue extension.
Parosteal osteosarcoma involving the posterior femur with broad-based attachment to the cortex and minimal medullary involvement.
Myxoid liposarcoma in the posterior knee compartment with high T2 signal and septal enhancement, extending into the popliteal fat.
Large soft tissue mass in the deltoid region with heterogeneous enhancement and internal necrotic areas, suggestive of pleomorphic sarcoma.
Ewing sarcoma involving the calcaneus with permeative lytic destruction, cortical erosion, and a surrounding soft tissue mass.
Parosteal osteosarcoma involving the posterior femur with broad-based attachment to the cortex and minimal medullary involvement.
Myxoid liposarcoma in the posterior knee compartment with high T2 signal and septal enhancement, extending into the popliteal fat.
Osteosarcoma of the proximal humerus with extension into the surrounding soft tissues and a classic sunburst periosteal pattern.
Alveolar soft part sarcoma in the midfoot, presenting as a well-defined mass with high T2 signal intensity and internal necrosis.
Chondrosarcoma of the tarsal bones with endosteal scalloping and ring-and-arc calcifications, with mild cortical expansion.
Large high-grade osteosarcoma in the proximal femur with cortical disruption, intramedullary extension, and a ‘Codman triangle’ periosteal reaction.
Synovial sarcoma in the plantar aspect of the foot with multi-lobulated appearance, heterogeneous T2 signal, and prominent perilesional edema.
Dedifferentiated liposarcoma in the iliopsoas compartment with mixed signal intensity and necrotic regions.
Epithelioid hemangioendothelioma in the proximal humerus with small lytic lesions and mild soft tissue extension.
Clear cell chondrosarcoma in the femoral neck with lobulated margins and hyperintense T2 signal in the medullary cavity.
Post-SBRT changes in the L3 vertebral body with marrow edema, sclerosis, and mild enhancement without evidence of residual metastatic disease.
Lytic lesion in the T9 vertebral body with high T2 signal and peripheral enhancement, consistent with metastatic progression post-SBRT.
Increased enhancement in a previously treated occipital metastasis with surrounding edema, suggestive of possible tumor recurrence.
Stable sclerotic changes in the left adrenal with no residual soft tissue component, consistent with post-radiation effect.
Post-SBRT changes in the L3 vertebral body with marrow edema, sclerosis, and mild enhancement without evidence of residual metastatic disease.
Stable treated lesion in the L5 vertebral body showing sclerotic transformation with no evidence of soft tissue extension, indicating successful local control.
Newly identified T1 hypointense lesion in the C7 vertebra with high T2 signal and peripheral enhancement, concerning for new metastatic focus despite SBRT.
Increased T2 signal and peripheral enhancement in a treated lesion in segment II, suggesting progression or residual viable tumor.
Post-SBRT changes in the right middle lobe with peripheral ground-glass opacities, fibrosis, and mild pleural thickening.
New subcentimeter nodule in the right upper lobe with spiculated margins and mild enhancement, suggestive of possible new metastatic disease.
Treated lesion in the left lower lobe with dense fibrosis, volume retraction, and absence of contrast enhancement, indicating complete response.
Increased enhancement in a previously treated occipital metastasis with surrounding edema, suggestive of possible tumor recurrence.
Persistent marrow edema in the right iliac crest with no enhancement, likely representing post-SBRT inflammatory changes.
Post-SBRT changes in the right middle lobe with peripheral ground-glass opacities, fibrosis, and mild pleural thickening.
Increased enhancement in a previously treated right adrenal mass, with new peripheral irregularities suggestive of possible recurrence.
New hypervascular lesion in segment IVa, suspicious for oligoprogressive hepatic metastasis despite prior SBRT treatment in adjacent segments.
Residual mass in the left upper lobe with central cavitation and rim enhancement, concerning for viable tumor post-SBRT.
Oligoprogressive metastatic focus in the right acetabulum with increased enhancement and surrounding soft tissue edema post-SBRT.
Persistent marrow edema in the right iliac crest with no enhancement, likely representing post-SBRT inflammatory changes.
Post-SBRT treated lesion in the left frontal lobe with central necrosis, surrounding gliosis, and decreased enhancement indicating treatment response.
Post-SBRT treated lesion in the left frontal lobe with central necrosis, surrounding gliosis, and decreased enhancement indicating treatment response.
Stable post-SBRT lesion in segment VI with surrounding biliary dilatation and mild intrahepatic edema consistent with radiation effect.
Diffuse hypointensity on T1 and hyperintensity on T2 in the perilesional region of the left temporal lobe, likely post-radiation effect.
Newly identified lesion in the left pubic ramus with high T2 signal and mild contrast enhancement, concerning for metastatic oligoprogression.
SBRT-treated lesion in segment VIII with peripheral fibrosis, mild retraction, and decreased vascularity, consistent with post-radiation changes.
Increased T2 signal and peripheral enhancement in a treated lesion in segment II, suggesting progression or residual viable tumor.
Residual mass in the left upper lobe with central cavitation and rim enhancement, concerning for viable tumor post-SBRT.
Post-treatment changes in the sacral region with signal alteration in the bone marrow and mild soft tissue edema consistent with radiation effect.
New hyperintense nodule on T2-weighted images in the right adrenal gland, concerning for oligometastasis not previously targeted by SBRT.
Increased enhancement in a previously treated right adrenal mass, with new peripheral irregularities suggestive of possible recurrence.
New 1 cm enhancing nodule in the right adrenal gland, concerning for oligoprogressive metastasis despite prior SBRT.
New enhancing lesion in the right parietal lobe with irregular borders and vasogenic edema, concerning for oligoprogressive metastasis.
Post-SBRT fibrosis in the left upper lobe with volume loss and traction bronchiectasis without evidence of residual or recurrent disease.