Answer
Scars from Chronic Infarctions on CT
CT in the nephrographic phase in the axial projection shows multiple scars in both kidneys. On the left there are 2 scars. The deeper scar goes down to the collecting system without a clubbed nor naked calyx, indicating that it Is likely of vascular origin. On the right side there are areas of cortical thinning and loss. The multicentric nature and presence of atherosclerotic disease in the aorta raises the possibility of cholesterol emboli as a cause of the infarctions
Ashley Davidoff MD TheCommonVein.net