Lipomatous hypertrophy of the interatrial septum (LHIS) is the overgrowth of the fat normally present in the interatrial septum. The right and left atria are separated by this fatty deposit. The fossa ovalis is spared in greater than 90% of patients, giving the appearance of a dumbbell.
Reference
- Cardiac Imaging: The Requisites, 3rd edition. p 149
- Heyer CM, et al. Lipomatous Hypertrophy of the Interatrial Septum: A Prospective Study of Incidence, Imaging Findings, and Clinical Symptoms. Chest 2003; 124(6): 2068-2073.
Lipomatous hypertrophy of the interatrial septum (LHIS) is the overgrowth of the fat normally present in the interatrial septum. The right and left atria are separated by this fatty deposit. The fossa ovalis is spared in greater than 90% of patients, giving the appearance of a dumbbell.
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