BACKGROUND
Lipomatous hypertrophy of the interatrial septum (LHIAS) is a well-described benign cardiac tumor. LHIAS is a quite frequent finding seen by echocardiography. It is estimated to be presented in up to 8% of the general population. (1)
LHIAS is typically diagnosed by Transthoracic echocardiography (TTE). However, in some cases, it may have an atypical appearance by TTE, especially when the echo images are suboptimal.
Differential diagnosis consists of atrial masses such as myxomas or lipomas.(2)
Interatrial septum thickness of 6 mm in the general population and 7mm in the elderly are considered normal.(3) Lipomatosis has been defined as a thickness greater than 15 mm.(4) Adipose tissue can also accumulate in sub epicardium, crista terminalis, endocardium, and the mediastinum.