Minimally invasive surgeries have influenced the field of surgeries in a variety of ways specially females and cosmesis. We present a case with a diagnosis of SV-ASD who underwent Right Mini-Thoracotomy ASD closure. Basic pre-operative investigations were done. During the course of surgery a vessel was clipped near the A-P window, post surgery she developed signs of right ventricular dysfunction. The clipped vessel turned out to be an important vessel when a conventional angiogram was done - an anomalous origin of RCA. Emergency coronary artery bypass was performed and patient recovered uneventfully. In a setting of decreased operating space, mapping of coronary vessels may provide us added information which may avert complications.