Coronary angiography by right radial artery route using Optitorque Tiger catheter is on the rise given the low rate of local complications and feasibility to perform it as a day-care procedure. We report here a case of coronary angiography performed using Optitorque Tiger catheter (5-French) which resulted in a diagnostic error, missing the ostio-proximal left main coronary artery disease which was later detected using EBU 3.5 guide catheter (7-French) while performing angioplasty.