MRCP UK EXAMINATIONS

Detailed explanation-1: -Lipomatous hypertrophy of the interatrial septum (LHIS) is a relatively uncommon disorder of the heart characterized by benign fatty infiltration of the interatrial septum that usually spares the fossa ovalis. The prevalence of LHIS is estimated to be between 1% and 8% [1].

Detailed explanation-2: -Lipomatous Hypertrophy of the Interatrial Septum (LHAS) is an unusual condition, usually a benign condition and most often detected as an incidental finding on echocardiography. The classic finding is a homogenous, bi-lobed configuration of the interatrial septum with sparing of the fossa ovalis.

Detailed explanation-3: -Lipomatous hypertrophy of the interatrial septum is a common finding seen on echocardiography with an incidence reported to be 1–8% of the general population. It is more commonly seen in women and in the elderly and is associated with obesity, steroid use, and emphysema.

Detailed explanation-4: -Lipomatous hypertrophy of the IAS is defined as > 20 mm fatty thickening of the IAS usually sparing the fossa ovalis [1]. Histologically, lipomatous hypertrophy of the IAS is characterized by the deposition of normal fat; multi-vacuolated fat; and enlarged, atypical myocytes in the IAS.

Detailed explanation-5: -The fossa ovalis is a depressed structure, of varying shapes, located in the inferior aspect of the right interatrial septum.