giant malignant hemangiopericytoma of the orbit

An 81-year-old man with hemangiopericytoma had clinically conspicuous manifestation of a first slowly then rapidly growing, painless, and sublobe-like mass in the left orbit, proptosis, massive bleeding, and underwent orbital exenteration with keeping the eyelids. The tumor reoccurred 21 months after the operation and the patient had prolonged, serious hemorrhage in the left orbit and died of brain metastasis six months later. The etiology and inducement factors were unknown, but it is suspected that the fatal family casualty might be a more important inducement than trauma for this patient