Mature (cystic) ovarian teratoma

Case contributed by Bruno Di Muzio


Right lower quadrant pain. Appendicitis?

Patient Data

Age: 13 years
Gender: Female

CT Abdomen and pelvis


There is a large solid-cystic pelvic mass (~230ml) displacing the uterus posteriorly and compressing the bladder inferiorly, it is predominantly cystic (~20HU) and has a nodular fat tissue (-68HU) component with some gross peripheral calcifications. There is a mild amount of free fluid in the pelvis. The remainder exam is unremarkable. 

Case Discussion

This case demonstrates a large predominantly cystic mass in the pelvis of a young girl. Its fat tissue component and calcifications give the clue for the diagnosis of a mature cystic ovarian teratoma. It is really hard to consider another differential in this patient and with those radiologic features; a malignant degeneration is unlikely, however, it is impossible to exclude by imaging.

The diagnosis of this case is only based on images; no further clinical data were available. 

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