DOI: https://doi.org/10.36347/sjmcr.2025.v13i10.015

Pages: 2247-2249

Ascaris lumbricoides is a common intestinal parasite in humans, but its presence in the urinary tract is extremely rare. We report the case of a 55-year-old man admitted with lower urinary tract symptoms complicated by acute urinary retention. Catheterization revealed the spontaneous expulsion of a bladder stone and a worm, later identified as Ascaris lumbricoides. Stool examinations for ova and parasites were negative. Imaging studies showed a 9 mm pelvic ureteral stone and a 12 mm intravesical stone, while cystoscopy revealed inflammatory changes consistent with chronic cystitis. No evidence of enterovesical fistula was found. Based on clinical and radiological findings, retrograde urethral migration of the parasite was considered the most likely mechanism. Urinary ascariasis is an exceptional condition, with only a few cases described in the literature involving the bladder, ureter, or kidney. This case highlights the importance of considering parasitic infestation in patients with atypical urinary symptoms, particularly in endemic regions.