Reports of extragenital malignant mixed Mullerian tumor (MMMT) type th
ough extremely rare have increased. This represents the 15th reported
case of MMMT outside the female reproductive tract. A 68-year-old blac
k woman presenting with abdominal pain, increasing abdominal girth, an
d a provisional diagnosis of ovarian carcinoma, underwent exploratory
laparotomy, total abdominal hysterectomy, omentectomy and cytoreductiv
e surgery. Surgery and histology revealed MMMT of heterologous type in
the pelvic peritoneum, with no tumor in the genitalia and no foci of
endometriosis. Despite surgical debulking leaving residual tumor of le
ss than 1 cm followed by aggressive systemic chemotherapy, the patient
died of disease within 2 months. Increasing exploratory surgery may a
ccount for the increase in reports of extragenital MMMT. Aggressive tu
mor debulking and multiagent systemic chemotherapy is of limited effic
acy since extragenital MMMT, like uterine MMMT with pelvic spread, has
short survival.