CTO is encountered in 10 15 of all the cases who undergo coronary angiography for coronary disease. Till about a decade ago it was the second commonest cause for coronary disease to undergo bypass surgery first common cause is valvular heart disease . The success rate of recannalization of totally occluded major epicardial vessel is close to 90 . The advances in hardware development of skill and better understanding of pathophysiology have improved the success rate. Restenosis rates after stenting are not very different from non totally occluded significant coronary lesions.