Wedge-shaped hypodensity --> renal infarct. Kidneys receive a large amount of body's cardiac output, so they are a common site of infarction due to emboli from Atrial fibrillation.

So I struggled ruling out smoking b/c Virchow Triad/endothelial damage leading to thrombosis and infarction.

However - smoking seems like it would predispose more to a thrombosis in the larger arteries and lead to a more global ischemia of the kidney. An embolic process makes more sense since there are multiple areas of infarction that are wedge shaped

FA 2020 PG 212 Common in normal aging increase risk of atrial fibrillation where there's possible Isolated atrial amyloidosis where ANP is fibril protein --)