Heterologous malignant mixed Müllerian tumor of the cervical stump.

A 76-year-old woman presented with vaginal bleeding 37 years following supracervical hysterectomy for a benign disease. Extensive malignant mixed Müllerian tumor was found in the remaining uterine cervix. This appears to be the first documented case of the malignant mixed Müllerian tumor arising in a cervical stump. Possibility of derivation of this tumor from endometriosis notwithstanding, the cervical Müllerian neoplastic potential parallels that of the endometrium because of the developmental kinship of the two. This potential has been fully retained and expressed as a tumor in the cervical stump in this case.