Liposarcomas
Localization: Anywhere there is fat. Most common in thigh, retroperitoneum, inguinal region, and popliteal fossa. Never in the hands, feet, and neck. Clinical: Insidiously growing, deep-seated, ill-defined mass that usually…
Parosteal Osteosarcoma
Localization: Almost exclusive of the long bones, it originates from the metaphysis. Rare in the diaphyses, exceptional in flat bones. The most typical site is the distal metaphysis of the…
Vascular Tumors: Hemangioma, Epithelioid Hemangioendothelioma, and Angiosarcoma
Clinical: Superficial (cutaneous/subcutaneous) hemangiomas are reddish-wine-colored painless lesions, generally present at birth. Intramuscular hemangioma arises within the belly of a single muscle; only in the hand and foot it may…
Synovial Sarcoma (SS)
Location: 80 % extremities. Lower limb (60 %: thigh, knee, foot, ankle) and upper limb (23 %: forearm, wrist, shoulder). Only 10 % within a joint. Usually, close to a…
Myositis Ossificans
Clinical: Posttraumatic type: painful enlarging mass with intense inflammation of the surrounding tissues. If the involved anatomic compartment is immobilized, inflammation resolves, and the mass slowly regresses. Complete maturation of…
Myofibroblastic Sarcoma
Location: Low-grade myofibroblastic sarcomas most commonly occur in the head and neck region, including the oral cavity, pharynx and parapharyngeal regions, and proximal extremities and trunk; occasional cases can occur…
Extraskeletal Myxoid Chondrosarcoma
Location: Deep-seated, proximal extremities and trunk. Clinical: Enlarging painless soft tissue mass. Imaging: Although imaging characteristics are nonspecific, most tumors appear lobulated, and highly myxoid tumors have a homogeneous high…
Alveolar Soft Part Sarcoma
Location: Deep-seated, lower limb within the muscle, thigh. Clinical: Globose or multinodular mass, slowly increasing, and painless. Tumor may be large, present from many years, and richly vascularized with pulsation…
Ewing Sarcoma (ES)
Localization: ES is as frequent in flat and short bones as it is in long bones. Among the appendicular skeleton, the most common localization is the femur, followed by the…
