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[Lipomatous Hypertrophy of Interatrial Septum in Patient with Venous Thrombus:Report of a Case].

A 64-year-old female underwent a computed tomography (CT) examination of the chest because of pneumonia, which revealed lipomatous hypertrophy of the atrial septum. During medical treatment for pneumonia, venous thrombus of the superior vena cava occurred and then disappeared following apixaban administration. The patient refused surgery at that time, thus follow-up examinations include CT scans were conducted at the outpatient clinic. Two years later, the tumor became larger, and this time she accepted surgery. Under total cardiopulmonary bypass with beating heart a 5.0×3.5 cm tumor was resected. Because of its location very close to superior vena cava, upper area of the right atrium was augmented using a bovine pericardium. Following surgery, sick sinus syndrome developed and pacemaker implantation was performed. Thereafter, the patient had a smooth recovery and no recurrence is noted one year since.