Female preschooler with pelvic pain

CT of ovarian teratoma causing ovarian torsion.
Axial (above left), sagittal (above right) and coronal (below) CT without contrast of the abdomen show a large thick walled, fluid-filled, unilocular mass just above and to the right of the bladder which contains focal areas of fat density material and calcific density material. There is a small amount of ascites.

The diagnosis was ovarian teratoma causing ovarian torsion.