A Case of an Idiopathic Enlargement of the Right Atrium, Lacking in Prominent Right Atrium Contour and Mimicking Left Pericardial Defect on the Chest X Ray Shinji Uchida 1 , Daiji Saito 1 , Naotsugu Obayashi 1 , Hiroo Kobayashi 1 , Kozo Mizuo 1 , Tetsuya Sato 1 , Kiyoaki Maekawa 1 , Hiroshi Yamanari 1 , Katashi Matsubara 1 , Shoichi Haraoka 1 1Department of Cardiovascular Medicine, Okayama University School of Medicine Keyword: 特発性右房拡張症 , 左側心膜欠損症 , idiopathic enlargement of the right atrium , left pericardial defect pp.493-496
Published Date 1993/5/15
DOI https://doi.org/10.11477/mf.1404900672
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A 47-year-old man was admitted for evaluation of heart murmur in 1982. On admission, two-dimensional echocardiogram showed a giant right atrium with mild tricuspid regurgitation, but a chest X ray showed no prominent right atrium contour. Echocardiographic finding at various postures and chest X ray with artificial pneumothorax indicated little likelihood of left pericardial defect. An angiocardiogram and computed tomograghy showed the dilated right atrium with clockwise rotation. There was no indication of right atrial overload. Therefore, we made the diagnosis of an idiopathic enlargement of the right atrium.

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