Female teenager with pelvic pain, normal WBC and a negative pregnancy test

US of simple ovarian cyst
Transverse transabdominal US of the pelvis (above) shows a round anechoic mass that is inferior to the bladder and to the left of midline uterus. Sagittal magnified US of the mass (below) shows it to be within the ovary and anechoic in nature.

The diagnosis was a simple ovarian cyst.