Vaginal calculus is a rare condition. The cases that have been mentioned in the literature were thought to be caused by vaginal cysts, calcified fibroid tumors, or urinary leakage into the vagina. One case (Reeb3) was thought to be due to calcification of mucous cells.A case of vaginal calculus is reported apparently caused by stagnation of the menstrual flow due to an almost imperforate hymen and an apparent congenital stenosis at the midportion of the vagina.