A CASE OF RETROPERITONEAL SMOOTH MUSCLE TUMOR OF UNCERTAIN MALIGNANT POTENTIAL (STUMP) WITH PRIOR HYSTERECTOMY

Abstract

A case of retroperitoneal smooth muscle tumor of uncertain origin (STUMP) with prior hysterectomy is presented. A 71-year-old woman was noted with lower abdominal mass. The patient underwent complete excision of the pelvic retroperitoneal tumor and the tumor weighed 1, 065g. Immunohistochemistry revealed that the tumor was of smooth muscle tumor origin. Histological examination showed that the mitotic index was 5/10 high power fields (HPF) with mild nuclear atypic. MIB-1 labeling index of this tumor was less than 5%. We concluded that this tumor was STUMP.