Massive Subchorionic Thrombosis Followed by Magnetic Resonance ImagingHimoto, Yuki MD; Okumura, Ryosuke MD, PhD; Tsuji, Natsuki MD; Nagano, Tadayoshi MD, PhD; Fujimoto, Masakazu MD; Yamaoka, Toshihide MD, PhD; Kohno, Shigene MD, PhDJournal of Computer Assisted Tomography: May/June 2012 - Volume 36 - Issue 3 - p 330–333 doi: 10.1097/RCT.0b013e3182540ced Abdominal Imaging Abstract Author Information Massive subchorionic thrombosis is a rare condition, defined as a large thrombus confined to the subchorionic space. It is associated with poor perinatal prognosis. However, prenatal diagnosis by ultrasonography is often difficult. We report a case of massive subchorionic thrombosis developing dermatomyositis after the delivery, followed by magnetic resonance imaging. Moreover, we review other 4 cases assessed with magnetic resonance imaging. Magnetic resonance imaging is very useful for confirmation of diagnosis and follow-up in combination with ultrasonography. From the Departments of *Radiology, †Obstetrics and Gynecology, and ‡Pathology, Kitano Hospital, Osaka; and §Department of Radiology, Kyotokatsura Hospital, Kyoto, Japan. Received for publication February 21, 2012; accepted March 2, 2012. Reprints: Himoto Yuki, MD, Kitano Hospital, Osaka, Japan (e-mail: firstname.lastname@example.org). The authors report no conflicts of interest. Copyright © 2012 Wolters Kluwer Health, Inc. All rights reserved.