A 13 year old girl was brought by her parents with lower abdominal pain since six months. She had not attained menarche.
Transabdominal ultrasonography of the pelvis shows a heterogeneously hypoechoic collection with dense, dependent echogenic content in the vaginal canal. There is no vascularity in the echogenic content. The uterus is anteverted and is of normal size. The endometrial cavity is clear.