A case report of undifferentiated carcinoma of the endometrium.

A case of undifferentiated carcinoma of the endometrium a 42-year-old woman is reported. Endometrial cytology revealed tumor cells showing small clusters or dispersed distribution. The tumor cells had almost round nuclei, fine increased chromatin, small nucleoli, and a high N/C ratio. These findings indicated undifferentiated carcinoma, although histology was not diagnostic due to massive necrosis of the tumor. Histological examination of the resected uterus confirmed the diagnosis, emphasizing the usefulness cytology.