RESUMEN
Obstructed hemivagina and ipsilateral renal anomaly syndrome also known as Herlyn-Werner-Wunderlich syndrome is a rare congenital urogenital anomaly characterised by Mullerian duct anomalies associated with mesonephric duct anomalies. A 10-year old female presented with acute lower abdominal pain, urinary retention and scanty menstrual flow during her first menstruation. Ultrasonography and contrast computed tomography showed uterine didelphys, hematocolpos, obstructed hemivagina and left renal agenesis. Hemivaginal septal resection and drainage of the hematocolpos were done and operative findings also confirmed the final diagnosis. She was discharged and followed up after 2 weeks and her symptoms had resolved completely. Being a rare entity many clinicians and radiologists are unaware of this disease so this may lead to misdiagnosis whenever these cases present. So strong suspicion and knowledge of this disease entity are essential for a precise diagnosis. Keywords: case reports; hematocolpos; mullerian ducts; unilateral renal agenesis.