Müllerian carcinofibroma of the uterus. A case report.

BACKGROUND: Müllerian carcinofibroma is composed of malignant epithelial tumor (cancer) and benign mesenchymal tumors. It is the least frequent among mixed müllerian tumors. There are eight reported cases of carcinofibroma or cases showing similar histology, with only two of these cases recurrent. CASE: A case of müllerian carcinofibroma arose in the uterine body. The patient was an 83-year-old, postmenopausal female whose endometrial cytology revealed cell clusters of adenocarcinoma and scattered nonepithelial cells with enlarged nuclei without nuclear atypism or mitosis. Histology of the resected uterus showed a mixture of well to poorly differentiated adenocarcinoma, and fibromatous and leiomyomatous nonepithelial tumors without a transition between them. There was no sign of recurrence nine months after hysterectomy. CONCLUSION: Müllerian carcinofibroma seems to have a better prognosis than malignant mixed müllerian tumor. When both cancer cells and an abundance of nonepithelial cells are seen on gynecologic cytology, it may be important to consider mixed müllerian tumor and to differentiate müllerian carcinofibroma from malignant mixed Müllerian tumor by careful observation of the nuclear size, nucleoli, nuclear atypism and mitosis of the nonepithelial cells.