笹 秀典¹, 小林 久晃¹, 大沼 一也¹, 吉田 純¹, 小松 要介¹, 小林 充尚¹, 入江 喬介²

Hidenori SASA¹, Hisaaki KOBAYASHI¹, Kazuya OONUMA¹, Atsushi YOSHIDA¹, Yousuke KOMATSU¹, Mitsunao KOBAYASHI¹, Takasuke IRIE²

¹防衛医科大学校分娩部, ²アロカ(株)第1技術部

¹Department of Perinatal and Maternal Medicine, National Defense Medical College, ²The First Department of Technology, Aloka Co., Ltd.

キーワード : Ovarian tumor, Transvaginal ultrasonography, MRI, Image quality

Structural transvaginal ultrasonographic findings of 12 ovarian tumors were compared with the findings of magnetic resonance imaging (MRI) and their usefulness was evaluated. Of the ovarian tumors from 12 women (mean age, 41 years; range, 20-71 years), 3 were dermoid cysts, 5 were endometrial cysts, and 4 were ovarian carcinomas. Transabdominal and transvaginal ultrasonography (TVUS) and MRI were performed on these tumors preoperatively and the histopathological diagnoses were confirmed. The imagings of TVUS and MRI were evaluated in terms of contents, inner wall and septum, capsule and solid portion of the ovarian tumors. The findings showed that TVUS can detect hair in dermoid cysts, adhesion in endometrial cysts and the papillation from ovarian carcinoma better than MRI. But MRI can clearly identify hemorrhagic contents in endometrial cysts and the invasion in ovarian carcinoma better than TVUS. The image quality of the Aloka SSD 650 used for TVUS was better than that of the Mitsubishi MRI-150 S used for MRI. Both TVUS and MRI are useful in the differential diagnosis of ovarian tumors and each offers a distinctive advantage over the other.