75-year old gentleman presented with acute urinary retention. He had met with road traffic accident 15 years back and sustained pelvic fracture and bladder rupture, underwent bladder repair and open reduction and internal fixation of pubic symphsis. Imaging studies showed the free lying encrusted orthopedic screw in the bladder, which was removed per urethra using nephroscope. Migratory foreign bodies in the urinary bladder are rare. However there is a possibility of longstanding foreign bodies in adjacent structures to erode and perforate into the bladder. Inside the bladder these foreign bodies act as nidus for stone formation.
Puvai Murugan, P., & Ramalingam, M. (2016). Endoscopic Management of Free Lying Migratory Orthopedic Screw in Bladder. Urology Case Reports, 8, 47–48. https://doi.org/10.1016/j.eucr.2016.05.014