Lipomatous hypertrophy of interatrial septum

Lipomatous hypertrophy of the interatrial septum is being increasingly recognised and should be considered as part of the differential diagnosis for any cardiac tumour. We present the case of a 65-year-old male patient who presented at the emergency department complaining of palpitations. Transthoracic and transoesophageal echocardiography detected a lipomatous membrane separating the dilated left atrium from the right atrium. Diagnosis was confirmed by MRI. In such cases, the opinion of a specialist echocardiologist would help to avoid a misdiagnosis and unnecessary intervention.