Prognosis Hemangiomas → benign lesions Hemangioendothelioma → good prognosis Angiosarcoma → poor prognosis 51.1 Characteristics of the Single Entities 51.1.1 Hemangioma of Bone Definition: Benign solitary tumor composed of newly formed vessels. Epidemiology: Rare tumors, accounting…

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…

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…

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…

Location: 85 % in the sacrococcyx or in the spheno-occipital region. Fifteen percentage in the vertebral body. Clinical: Early symptoms in C. of the base due to compression of the…

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…

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…

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…