Obstructive Sleep Apnoea (OSA) is a sleep related breathing disorder affecting a significant section of middle aged population. The pro inflammatory state that exists in OSA patients contributes to accelerated atherosclerosis and increased incidence of cardiovascular and cerebrovascular disease. Coronary Artery Calcium (CAC) has emerged as a non invasive tool for assessment of underlying atherosclerosis. It helps predict future cardiovascular  events,  thereby  helping in risk stratification and modifying treatment decisions. The scope of CAC scoring in specific subpopulation of OSA patients remains to be defined.