ABSTRACT Introduction The incidence of renal complication following BCG treatment is rare. Few previous studies have reported a solitary renal granuloma distinct from the renal pelvis following BCG treatment. Case Presentation An 85‐year‐old male underwent transurethral resection of the bladder tumor. A 6‐week induction of intravesical BCG instillation therapy was planned; however, the sixth instillation was canceled owing to fever. Regular follow‐up revealed no recurrence. However, 4 years later, CT revealed a right renal mass. With a clinical diagnosis of renal cell carcinoma, robot‐assisted partial nephrectomy was performed. The pathological diagnosis was epithelioid cell granuloma with caseating necrosis. Stress cystography revealed no vesicoureteral reflux. Conclusion A renal granuloma caused by BCG is one of the differential diagnoses for solitary renal mass following BCG treatment, even if the mass is not adjacent to the renal pelvis.
OKA et al. (Thu,) studied this question.
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