AbstractBackground: Coronary artery ectasia (CAE) is a well recognized angiographic finding, characterized by abnormal dilatation of the coronary arteries. Abnormal epicardial dilatation of the coronary arteries has been recognized for decades. The most widely used term for this condition now is “coronary artery ectasia”. However, the incidence of CAE is may be due to several factors. The present study is done to study the clinical as well as angiographic characteristics of the patients who underwent coronary angiography. Methods: A total of 600 CAG’s (coronary angiography) done were randomly selected from our institute and were reviewed. Calculation of vessel lumen diameter and clinical variables such as age, sex, and occupation and serum lipid levels were noted. Results and Observation: Among the 600 CAG’s reviewed 20 cases were (3.3%) were found to have Coronary artery ectasia (CAE) among 16 were male (80%) and 4 (20%) were female. Parameters like both diabetic and hypertensive, obesity conditions were also evaluated. The present study also evaluated that the atherosclerotic coronary artery disease as the major cause of ectasia. Markis Type IV was found to be high when compare with other types. Conclusion: Coronary artery ectasia represent not an uncommon form of atherosclerotic coronary artery disease seen in approximately 5% cases undergoing coronary angiography. In view of the slow progression and complex manifestations of atherosclerosis, CAD at a certain stage might result in aneurysmal dilatation. This transition is unpredictable based on our current knowledge. The present study is a small step in understanding them.