Actinomycosis of the kidney is a rare bacterial infection, which poses a diagnostic challenge. Because the diagnosis can mimic a renal tumor, excision is often the diagnostic and therapeutic option. We describe the first case of renal actinomycosis in a woman with previously diagnosed renal cell carcinoma of the contralateral kidney. In contrast to most cases, sparing of her only functioning kidney was the priority that prompted a conservative diagnostic approach and treatment, as equally effective as surgery.
From the *Medical Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD; †Division of Hematology and Oncology, Department of Internal Medicine, School of Medicine, University of Michigan, Ann Arbor, MI; ‡Department of Pathology, and §Division of Infectious Diseases, Department of Medicine, School of Medicine, University of Massachusetts, Worcester, MA.
Correspondence to: Elisabet Esteve Manasanch, MD, National Institutes of Health, 9000 Rockville Pike, Bldg 10, 12N226, Bethesda, MD 20892. E-mail: email@example.com.
The authors have no funding or conflicts of interest to disclose.