Lipomatous Hypertrophy of Interatrial Septum in Asssociation of Hypertrophic Cardiomyopathy: A Case Report

Lipomatous hypertrophy of interatrial septum (LHIS), usually found in echocardiography, is a rare non-neoplastic disease entity, which may cause arrhythmia or sudden death. We reported a case of LHIS associated with hypertrophic cardiomyopathy (HCM), which was suspected a hyperechoic intraatrial tumor in transthoracic echocardiography. Magnetic resonance (MR) imaging showed fat infiltration of the interatrial septum, indicating lipomatous hypertrophy in addition to hypertrophic myocardium. Combined HCM and LHIS were assumed incidental but had not been reported to our knowledge. Characteristic MR imaging of LHIS is an important supplement to echocardiography with ambiguous findings.