[Clinical Picture] Cryptic metastatic calcification after radical nephrectomy in a patient with renal cell carcinoma

A 58-year-old man was referred to the urology department of the Second Affiliated Hospital of Anhui Medical University (Hefei, China) with lower back pain in April, 2023. Abdominal CT scan revealed a left renal tumour, and enhanced CT imaging suggested renal cell carcinoma. Blood tests showed hypercalcaemia (3·44 mmol/L; normal range 2·11–2·52 mmol/L) and elevated serum urea nitrogen (9·83 mmol/L; normal range 3·1–8·0 mmol/L) and serum uric acid (519 μmol/L; normal range 208–428 μmol/L), and decreased serum phosphorus (0·83 mmol/L; normal range 0·97–1·61 mmol/L).