ABSTRACT Imperforated hymen occures rarely in newborns. The estimated frequency is approximately 0.1% in female newborns. During nine years (1992-2000), nine patients (aged 12-14 year, mean 13.2 year) with imperforated hymen admitted in Firoozabady hospital. The diagnosis was based on history, physical examination (genital-rectal) and ultrasonography. Of the 9 patients, 5 (56%) presented with urinary retention. One patient had hydronephrosis. Urinary symptoms disappeared after the operation. A history of no menses in an adolescent girl with abdominal and urinary complaints is cause for consideration of imperforated hymen.

Keywords: 1)Imperforated hymen 2) Haematometrocolops 3) Hydronephrosis

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