Primary Transitional Cell Carcinoma of the Endometrium: A Case Report and Review of Literature.

Transitional cell carcinoma of the endometrium is a rare cancer. We present a 58-year-old Caucasian female was diagnosed with high-grade polyploid transitional cell carcinoma of the endometrium. The pathological findings included a dense serosal adhesion over the fundus and the posterior wall, necrotic and polyploid papillary mass in the endometrial cavity, serosal adhesions and unremarkable parenchyma in the fallopian tubes. Others were the presence of cancer antigen 125 and cytokeratin 7 and absence of cytokeratin 20, actin, estrogen receptor, soluble protein 100, vimentin, and cytokeratin high molecular weight. The case is relevant to practice as it identifies the histological patterns for primary transitional cell carcinoma of the endometrium, including expressing cytokeratin 7 instead of cytokeratin 20. The tumor showed a papillary and solid architecture and composed of undifferentiated to poorly differentiated cells with no defined glandular nor squamous differentiation.