Case Reports—CardiovascularInferior Type Sinus Venosus Atrial Septal Defect MR FindingsHidalgo, Alberto MD* †; Ho, Mai-Lan MD*; Bhalla, Sanjeev MD*; Woodard, Pamela K. MD*; Billadello, Joseph J. MD‡; Gutierrez, Fernando R. MD*Author Information *Mallinckrodt Institute of Radiology ‡Division of Cardiology, Department of Medicine, Washington University School of Medicine, Saint Louis, MO †Radiology Department, Thoracic Radiology Section, Hospital de Sant Pau, Barcelona, Spain Grant Funding: Dr Hidalgo was supported by a grant from Sociedad Española de Radiología Médica (02 JAHP Extranjero SERAM 2006). Financial Disclosure (F.R.G.): Investigator, Bracco Group. Reprints: Dr Alberto Hidalgo, MD, Radiology Department, Thoracic Radiology Section, Hospital de Sant Pau, S Antoni M Claret, 167, Barcelona 08025, Spain (e-mail: [email protected]). Journal of Thoracic Imaging: November 2008 - Volume 23 - Issue 4 - p 266-268 doi: 10.1097/RTI.0b013e31817e2446 Buy Metrics Abstract Atrial septal defects can occur at various levels of the interatrial septum. Sinus venosus atrial septal defect (SVASD) results from abnormal resorption of the embryologic sinus venosus, and may be of the superior or inferior type. In this paper, we describe a 46-year-old man with inferior-type SVASD who presented with arrhythmias and dyspnea. Cardiac magnetic resonance and cardiac catheterization were useful in evaluating the anatomic/functional characteristics of inferior-type SVASD and distinguishing it from unroofed coronary sinus. © 2008 Lippincott Williams & Wilkins, Inc.