Central Low-Grade Osteosarcoma
Localization: Preferred sites are long bones, particularly the distal femur and proximal tibia. Rare in flat bones, exceptional in the hands and feet. It is usually centered in the metaphysis…
Dedifferentiated Chondrosarcoma
Location: Proximal femur, pelvis, and proximal humerus. Clinical: On a history of long duration with moderate symptoms, a rapid progression of pain and swelling occurs. Pathologic fractures frequent. Imaging: On…
Neurofibromas
Location: (a): Superficial lesion in subcutis or dermis. (b): All sites and all organs. Clinical: (a) Painless nodule, few symptoms. (b) Café au lait spots, typically in the axilla. More…
Periosteal Osteosarcoma
Localization: Tibia and femur. Less frequent in the humerus, rare in the fibula and other long bones. Usually located in the diaphysis, occasionally in the metaphysis. Clinical: Palpable mass and…
Fibromatosis
T2 MR images, coronal of the thigh and sagittal of the foot. The thigh lesion has a low signal and infiltrates the muscles, whereas one in the foot is nodular…
Dermatofibrosarcoma Protuberans
Location: Trunk, groin, and proximal extremities. Clinical: Nodular or plaque-like painless cutaneous tumor, slowly growing. Diagnosis: A well-defined superficial tumor. On MRI, in T1 usually iso- or hypointense to skeletal…
Peripheral (Secondary) Chondrosarcoma
Imaging: On x-ray – typical aspect of an osteochondroma with more abundant calcifications or ossifications, intense, and diffused radiopacities, with thicker superficial uncalcified layer and with fuzzy margins towards the…
Extra-abdominal Fibromatosis
Clinical: Deep, painless, firm or hard, and poorly circumscribed mass that may be adherent to the skin or bone and that grows insidiously and slowly for several months. Tumor mass…
High-Grade Osteosarcoma of the Surface
Lateral radiograph of the knee and axial T1 MR image. The tumor forms bone, mainly develops in the soft tissues, but starts from the cortex, which has a limited lysis….
