PMC4771859_01
(A) T2-weighed magnetic resonance images of the pelvis in the sagittal plane at 16 weeks of gestation. A cystic mass (arrows) was found in the right adnexa. A lipid component could not be detected. (B) High-resolution transvaginal ultrasonography of the right ovary. A cystic mass (arrows) was detected next to the corpus luteum (arrowheads). (C) Noncontrast computed tomography with adaptive iterative dose reduction of the adnexal area was performed at 16 weeks of gestation. A tiny lipid component (arrow) was detected in the adnexal mass. (D) Macroscopic findings of the right ovarian tumor. The tumor measured 10 x 25 x 30 mm3 and contained adipose tissue and hair.
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Noncontrast magnetic resonance imaging (MRI, MAGNETOM Trio A Tim System 3T, SIEMENS, Erlangen, Germany) detected a cystic mass in the right ovary (Fig. 1A); however, since it was difficult to distinguish this mass from a luteal cyst, we could not confirm the diagnosis of ovarian teratoma. High-resolution transvaginal ultrasonography (RIC6-12-D convex probe, 5.0-13.0 MHz; Voluson E8, GE Healthcare UK, Buckinghamshire, England) detected a cystic mass next to the corpus luteum of the right ovary (Fig. 1B). Tochigi, Japan) with adaptive iterative dose reduction (AIDR) targeting the right adnexa showed that the mass had a very small lipid component (Fig. 1C). The volume CT dose index was 12 mGy, and the dose-length product was 432 mGy/cm. These findings were consistent with ovarian teratoma, and she was scheduled for laparotomy. The tumor measured 10 x 25 x 30 mm3 (Fig. 1D).