CTICasesLipomatous Hypertrophy of the Interatrial Septum
Imaging findings
Serial MRI chest scans over 10 years demonstrate progressive growth and accumulation of fat within the interatrial septum, sparing the fossa ovalis, causing significant narrowing of the SVC and triggering cardiac arrhythmias.
Key takeaways
Lipomatous hypertrophy of the interatrial septum (LHIS) is a benign deposition of brown fat. Although typically asymptomatic and stable, it can rarely show progressive growth over time, leading to compression of the SVC or adjacent pulmonary veins and triggering atrial arrhythmias, which may require debulking.
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