Lipomatous hypertrophy of the interatrial septum

Fatty lesions of the atria and interatrial septum

“…However, numerous accounts of the extension of this fatty lesion away from the septum exist (Fig. 1); these include extension to the root of the aorta and down the atrioventricular groove alongside the coronary sinus [5], along the lateral wall and roof of the RA [6,8], and encroaching on the free wall of the left atrium [9]. This lesion has also been shown to involve the caval veins [10], to grow as a pseudotumorous lesion projecting into the RA [11], and in one case to appear as nodular thickening of the circumferential RA wall, even involving the right atrial appendage [12].…”

Atrial lipomatous hypertrophy causing reduction in systemic venous return

“…Some authors have suggested an association with older age and obesity [1,2,3,4]. LHIAS is generally asymptomatic and may be incidentally found at postmortem, representing 0.6% of all benign cardiac tumours [5,6].…”

“…Lipomatous hypertrophy of the interatrial septum (LHIAS) is a benign condition characterized by an abnormal deposition of adipose tissue in the interatrial septum which appears as a pseudomass with a bilobed shape [1,2,3].…”