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DOI: 10.1148/rg.265045206
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RadioGraphics 2006;26:1431-1448
© RSNA, 2006

EDUCATION EXHIBIT

Developing an MR Imaging Strategy for Diagnosis of Ovarian Masses1

Izumi Imaoka, MD, Akihiko Wada, MD, Yasushi Kaji, MD, Takafumi Hayashi, MD, Michiharu Hayashi, MD, Michimasa Matsuo, MD and Kazuro Sugimura, MD

1 From the Departments of Radiology (I.I., A.W., T.H., M.M.) and Obstetrics and Gynecology (M.H.), Tenri Hospital, Tenri, Nara, Japan; the Department of Radiology, Shimane University School of Medicine, Izumo, Shimane, Japan (A.W., T.H.); the Department of Radiology, Dokkyo Medical University School of Medicine, Shimotsuga-gun, Tochigi, Japan (Y.K.); and the Department of Radiology, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan (K.S.). Presented as an education exhibit at the 2003 RSNA Annual Meeting. Received November 26, 2004; revision requested January 24, 2005; final revision received March 2, 2006; accepted March 17. All authors have no financial relationships to disclose. Address correspondence to I.I., Department of Radiology, Kinki University School of Medicine, 377-2 Ohno-Higashi, Osaka-Sayama, Osaka 589-8511, Japan (e-mail: iizumi{at}med.kindai.ac.jp).

Magnetic resonance (MR) imaging provides useful information for characterization of various ovarian masses as neoplastic or nonneoplastic and, when neoplastic, on a spectrum from benign to malignant. The use of MR imaging for diagnosis of ovarian masses includes consideration of morphologic characteristics and signal intensity characteristics on T1- and T2-weighted images. The morphologic characteristics of cystic masses, cystic and solid masses, and predominantly solid masses provide important information. In general, cystic masses represent benign tumors, whereas cystic and solid masses are strongly associated with malignancy. Predominantly solid masses include benign, borderline malignant, and malignant tumors. T1-weighted images provide useful information for characterization because hemorrhagic adnexal masses (eg, endometriotic cyst) and cystic teratomas can be correctly diagnosed when the mass has high signal intensity. Significant low signal intensity in solid masses on T2-weighted images is indicative of fibrothecomas and Brenner tumors because extensive fibrous tissue produces significant low signal intensity on T2-weighted images. A strategy for diagnosis of ovarian masses with MR imaging incorporates signal intensity characteristics into morphologic characteristics.

© RSNA, 2006






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