Fig. 3.

Uric acid kidney stone in a man aged 58 years old. The patient had a BMI above 30 kg/m² and suffered a type 2 diabetes mellitus and hypertension. Uric acid was the consequence of metabolic syndrome and diabetes. However, stone analysis provided evidence that uric acid was secondly deposited on a whewellite stone (white arrow) and that the first step of stone formation was a carbapatite Randall’s plaque (black arrow), suggesting the stone was initiated for a long time