This patient attended for pre-radio frequency ablation planning for drug refractory atrial fibrillation. The only abnormality demonstrated by transoesophageal echocardiography was a moderately dilated right atrium (RA). In our institution, 64-detector row computed tomography (CT) is now used as part of the pre-radio frequency ablation procedure. CT confirmed the transoesophageal echocardiography findings—normal …