Adenocarcinoma of female paraurethral duct showing neuroendocrine differentiation.

Two cases are presented in which a female urethral adenocarcinoma took the form of a diverticular cancer. The pathologic examination of each tumor revealed a columnar/mucinous type of adenocarcinoma with evidence of abundant mucous secretion. Some of the cancer cells were positive on immunohistochemical staining with the conventional neuroendocrine marker chromogranin A, indicating focal neuroendocrine differentiation. The present cases may indicate a possible site of origin for female paraurethral adenocarcinomas.