Summary

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.