title: Right heart dilatation: a rare vascular cause.
abstract: A 17-year-old boy with primary cardiac diagnosis of cor triatriatum, atrial septal defect (ASD) and patent ductus arteriosus (PDA) was referred for a cardiac MRI. He was operated on at 3 months of age with correction of the above-mentioned defects. During follow-up, on echocardiogram, he gradually developed moderate right ventricular dilation with preserved systolic function and a trace of tricuspid regurgitation. The interatrial septum was intact and the left chambers looked normal in size (see online supplementary video 1). Clinically, he was active and asymptomatic with saturations of 99% on air. Consequently, he was referred for an MRI scan to look for possible causes. The images are seen in figure 1.
  
  
  
  What diagnosis would you suspect from figure 1?Arteriovenous malformationLeft superior vena cavaLevoatriocardinal veinMeandering pulmonary vein.
authors.affiliation: East Midlands Congenital Heart Centre, Glenfield Hospital, University Hospitals of Leicester, Leicester, UK.
authors.forename: Ioanna
authors.initials: I
authors.lastname: Dima
authors.affiliation: Department of Radiology, Glenfield Hospital, University Hospitals of Leicester, Leicester, UK.
authors.forename: Aparna
authors.initials: A
authors.lastname: Deshpande
mesh_terms: D000293:Adolescent; D006328:Cardiac Catheterization / Q000295:instrumentation; D006330:Heart Defects, Congenital / Q000150:complications* / Q000000981:diagnostic imaging / Q000628:therapy; D006801:Humans; D017380:Hypertrophy, Right Ventricular / Q000000981:diagnostic imaging / Q000209:etiology* / Q000503:physiopathology; D018810:Magnetic Resonance Angiography; D008297:Male; D011652:Pulmonary Circulation; D011667:Pulmonary Veins / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000503:physiopathology