Extrauterine mesodermal (müllerian) adenosarcoma: a clinicopathologic analysis of five cases.

Five extrauterine examples (three pelvic and two ovarian) of a distinctive mesodermal (müllerian) mixed tumor previously described to occur in the uterus and designated müllerian adenosarcoma are reported. The tumors were diagnosed during the fifth to eight decades of life. They usually formed very large, partly cystic masses, which had occasionally spread to adjacent organs by the time of operation. On microscopic examination the tumors consisted of benign-appearing neoplastic glands lying in a sarcomatous stroma. The glands were lined by a variety of müllerian epithelial cell types, and the stromal element resembled endometrial stromal sarcoma. Three patients had malignant courses manifested by intrabdominal recurrence, distant metastases, or both. This tumor should be clearly distinguished from the more common forms of mesodermal (müllerian) mixed tumor in which the epithilial as well as the stromal component is malignant and the prognosis is much more grave.