[Retrovesical leiomyoma: a case report].

A 41-year-old woman was admitted to our hospital with the chief complaint of difficulty of urination during the previous 2 years. Physical examinations revealed a smooth round mass of about 6 cm in diameter at the vaginal anterior wall. DIP and MRI showed a retrovesical tumor which was composed of benign leiomyoma, according to the transvaginal needle biopsy report. The retrovesical tumor was excised by the transvaginal approach. The tumor, 7 x 6 x 4 cm in size and 109 g in weight, was histologically diagnosed as leiomyoma. This is the 21st case of retrovesical leiomyoma reported in the literature in Japan.