[Atresia hymenalis with acute urinary retention under the anti-histamine drug: a case report].

A case of atresia hymenalis with acute urinary retention under the administration of the anti-histamine drug for pollinosis was reported. The patient was an 11 year-old female, who complained with acute urinary retention under the administration of the anti-histamine drug. Ultrasonography and magnetic resonance imaging revealed an expansive urinary bladder and an intravaginal hematoma. Subsequently examination of the external genitalia revealed atresia hymenalis and hematocolpos. The symptoms disappeared completely after a hymenal incision and drainage. To our knowledge, approximately fifty cases of atresia hymenalis have been previously reported in Japan. For the urologists, atresia hymenalis may not be experienced because of the rarely gynecological disease. However, we believe it should be considered as one causative disease in pubescent girls who complaining of difficulty in urination. Subsequently an examination of the external genitalia should be performed.