A rare pathological entity of right ventricular diverticulum

A 61-year-old woman underwent contrast-enhanced computed tomography (CT) as a preoperative examination for gastric cancer and a right ventricular outpouching was incidentally detected. She had no medical history of myocardial infraction nor myocarditis. Coronary angiography showed no significant stenosis, and no myocardial disorders were shown on myocardial scintigraphy. We used multiple imaging modalities such as CT (Panels A and B), right ventriculography (Panel C), echocardiography (Panels D–G), and cardiac magnetic resonance imaging (Panels H and I). The outpouching communicated with the right ventricle (RV) at the apex through a small orifice. Due to a lack of myocardium in its wall, it exhibited no contractile function. Doppler echocardiography showed outflow from the RV on systole and inflow into the RV on diastole. We diagnosed it as a right ventricular diverticulum. We decided to regularly observe about this lesion without intervention.

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