Imperforate hymen with hematocolpos.

Presented are two cases of imperforate hymen with hematocolpos seen in a pediatric emergency department (ED) during a seven-month period. The first case presented with abdominal pain, urinary obstruction, and constipation on initial visit. The diagnosis was not made on the initial presentation. The patient was seen a second time, and final diagnosis was not made until a third visit to the pediatric outpatient clinic. The second case presented with syncope and bilateral lower abdominal pain. Ultrasound and subsequent surgery confirmed the physical findings in the ED of imperforate hymen and hematocolpos. Both patients underwent hymenectomy, and they have experienced no further symptoms.