Müllerian duct abnormalities (MDA) are developmental disorders leading to dysmorphism of the female genital tract. Currently the Buttram and Gibbons classification of these entities is widely used. We present a case of a young girl with uterus didelphys and ipsilateral renal agenesis.Key-word: Uterus, abnormalities.From: 1. Department of Radiology, University Hospital Brussels, UZ Brussel, Brussels, Belgium Address for correspondence: Dr. A. Talebian Yazdi, MD, Department of Radiology, University Hospital Brussels, UZ Brussel, Laarbeeklaan 101, B-1090 Brussel, Belgium E-mail: atalebiany@hotmail.com Fig. 1. -Axial T2WI demonstrating the presence of a didelphic uterus with a small right (short arrow) horn and an abnormally distended left horn (large arrow) due to a fluid collection consistent with old menstrual blood.