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We report a case of coronary cameral fistula arising from the left circumflex artery (LCX) draining into the coronary sinus. This 55-year-old male, with no prior symptoms or risk factors, presented with sudden-onset palpitations and sweating. Contrast enhanced computed tomography coronary angiogram as well as conventional coronary angiography revealed a hugely dilated extremely tortuous fistula from the LCX draining into the coronary sinus. This case is unique because of such a giant fistula remained totally asymptomatic till the sixth decade of life and with no perfusion defect on myocardial perfusion imaging.