Diagnosis: Cellular angiofibroma.     

            Comments: The histologic characteristics of this rare and benign tumor are: numerous small, medium and large vessels scattered in a fibrous stroma of variable cellularity (Fig. 1); some vessels with hyalinized wall (Fig. 2); occasional intravascular thrombi sometimes recanalized (Fig. 3); scattered small aggregates of adipocytes sometimes involving vessels (Fig. 4); and focal inflammatory infiltrate of lymphocytes, plasmocytes and mast cells. Fig. 5 shows four mast cells (arrows). A synonym of the tumor is angiofibroblastoma-like tumor in men.