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Figure 16a.   Duplex uterus with an obstructed hemivagina in a 12-year-old girl. (a) Transverse US scan shows a normal left uterus (arrow) and a dilated right uterus (U). (b) Longitudinal US scan obtained along the obstructed side shows a distended vagina (V) and the dilated uterine cavity (U). The right kidney was absent. (c) Transverse US scan shows an endometrial cyst (C) adjacent to the ovary and the dilated fallopian tube.