Key result
Lipomatous hypertrophy of the interatrial septum manifested as third-degree atrioventricular block and masqueraded as a primary cardiac tumor requiring open resection for diagnosis.
Lipomatous hypertrophy of the interatrial septum can masquerade as a primary cardiac tumor and manifest as third-degree atrioventricular block.
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Interatrial masses with heart block may represent lipomatous hypertrophy rather than tumor; this case extends the differential but leaves management implications open.
A 55-year-old patient was found to have complete heart block during preoperative assessment. Cardiac magnetic resonance imaging revealed an interatrial mass suggestive of primary cardiac tumor. Extensive evaluation including intracardiac biopsy and finally open resection revealed lipomatous hypertrophy masquerading as tumor. (Level of Difficulty: Intermediate.)
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Yavar et al. (2020) studied this question. Lipomatous hypertrophy of the interatrial septum manifested as third-degree atrioventricular block and masqueraded as a primary cardiac tumor requiring open resection for diagnosis.
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