Intrarenal foreign body presenting as a solid tumor
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Updated: Sep 26, 2026

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition
Published on: June 21, 2024
David Ben Meir1, Dov Lask, Rumelia Koren
1Department of Urology, Rabin Medical Center, Golda Campus, Petah Tikva, Israel.
Abstract:
A 45-year-old man underwent radical nephrectomy for an asymptomatic solid renal mass radiographically interpreted as a tumor. The pathologic examination revealed an intrarenal sponge forgotten during nephrolithotomy performed 5 years previously. The sponge was surrounded by a thick fibrous capsule. This case suggests that foreign body should be included in the differential diagnosis of a suspected renal mass in patients with a history of previous surgery.
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