Which among the following is not known to cause hematocolpos?

Hematocolpos is accumulation of menstrual blood in the vagina develops secondary to imperforated hymen. In cervical stenosis the menstrual blood cannot enter the vagina. An imperforate hymen is caused by pathologic changes of embryological reaction of urogenital sinus and Mullerian ducts. Following menarche, this congenital abnormality will cause symptoms and may be identified as hematocolpos, hematometra or hematosalpinx.