An unusual case of urinary retention due to imperforate hymen.

A 15 year old girl presented to the accident and emergency (A&E) department with a 24 hour history of lower abdominal pain, and was found to have acute urinary retention. She was discovered to have an imperforate hymen with associated haematocolpos and haematometrium. This is rare and is hence a very unusual presentation to the A&E department. Patients presenting with retention of urine should be carefully assessed for the cause.