Lipomatous hypertrophy of the interatrial septum
 Discussion of Lipomatous hypertrophy of the interatrial septum
- Lipomatous hypertrophy of the interatrial septum (LHIS) is a benign condition characterized by fat accumulation in the interatrial septum.
- LHIS is unencapsulated mass that can contain adipocytes, myocytes, and mild interstitial fibrosis.
- LHIS is a result of adipose cell hyperplasia
- LHIS is linked to increasing patient age and obesity.
- LHIS is often asymptomatic but is associated with atrial arrhythmias, altered P-wave configurations, recurrent pericardial effusions, and sudden cardiac death.
 Imaging Findings for Lipomatous hypertrophy of the interatrial septum
- Diagnosis is made with CT when a smooth, nonenhancing, well-marginated fat-containing lesion in the interatrial septum is identified.
- Lesion characteristically takes on a dumbbell shape, with relative sparing of the oval fossa.
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 References for Lipomatous hypertrophy of the interatrial septum
- Scott C. Gaerte, Cristopher A. Meyer, Helen T. Winer-Muram, Robert D. Tarver, and Dewey J. Conces, Jr. Fat-containing Lesions of the Chest. RadioGraphics 2002 22: 61S-78S