CARCINOSARCOMA (MALIGNANT MIXED MULLERIAN TUMOR) OF THE UTERUS WITH ARHABDOID TUMOR COMPONENT - AN IMMUNOHISTOCHEMICAL, ULTRASTRUCTURAL, AND IMMUNOELECTRON MICROSCOPIC CASE-STUDY

A case of uterine carcinosarcoma (malignant mixed mullerian tumor) of the uterus containing a rhabdoid tumor element is described. In additi on to a malignant glandular component and anaplastic sarcomatous areas , this tumor had multiple foci with histologic and ultrastructural fea tures of malignant rhabdoid tumor. Vimentin positivity by immunohistoc hemistry was confirmed by immunoelectron microscopy. Although three ma lignant rhabdoid tumors of the uterus have been previously described,( 1-3) in addition to rhabdoid differentiation in an endometrial stromal sarcoma,(4) to our knowledge this is the first report of rhabdoid tum or differentiation occurring within a uterine carcinosarcoma.