Giant pelvic teratoma

A 23-year-old female patient, with no known history, consulted for acute recurrent urine retention. A study was started with abdominal ultrasound, which was then completed with CT scan and MRI (Figs. 1 and 2) of the pelvis. The findings of these tests revealed a 12-cm sacrococcygeal teratoma.

Figure 1

Figure 2

Mature cystic teratomas are the most common ovarian tumors. On MRI, they appear as a typical ‘bag of marbles’ image, where floating globules usually have a nest composed of detritus, scaly material, or fine hairs that is hyperintense on T2 and hypointense on T1.