Case report of a peripheral artery disease patient with its aetiology clarified by retrograde angioscopy.

It is important to understand the aetiology of ALI in each case for the management of the patient. Angioscopy can be a useful modality to identify the aetiology. It was found that retrograde angioscopy has several advantages over antegrade angioscopy in clear visualization and intentional control of the angioscopy catheter. This methodology may help us identify the aetiology of ALI by evaluating the vessel walls of patients with peripheral artery disease more precisely.