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Fig. 3B. —83-year-old man with solitary kidney referred for percutaneous ablation of renal mass suspicious for renal cell carcinoma. Follow-up axial T1-weighted enhanced MR image obtained 2 weeks after A shows subtle reduction in size of now wedge-shaped mass (arrowhead) to 1.7 cm. Diagnosis of focal bacterial pyelonephritis was made, and patient was treated with antibiotics.