Abstract
RATIONALE: Displacement of an intrauterine contraceptive device (IUD) is a rare and serious complication of IUD insertion. Theoretically, it can migrate to anywhere in the pelvic and abdominal cavity. However, it is not usual for an IUD to migrate to the bladder. PATIENT CONCERNS: In this case report, we reported a patient with chronic urinary symptoms caused by the migration of an IUD into the bladder. The displacement of the IUD led to contraception failure and IUD retention in the bladder for 5 years. DIAGNOSES: Pelvic ultrasonography (US), radiography, and cystoscopy examinations confirmed the migration of IUD in bladder. INTERVENTIONS: The patient underwent cystoscopy. OUTCOMES: The MCu IUD was successfully removed without any complications. LESSONS: Our study demonstrated that a missing IUD should be followed up and removed early to avoid possible serious complications.