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Retrograde cystography and computed tomography (CT) are considered the gold standard for investigating bladder and pelvic bone injury. However, these methods can miss extraperitoneal bladder rupture caused by a penetrating bone fragment from a pelvic bone fracture. We experienced a routine conventional cystography and CT scan that failed to identify penetration of the bladder by a bone fragment, which thus delayed optimal treatment. Therefore, different diagnostic methods such as CT cystography or cystoscopy should be considered to rule out penetrating injury by a bony fragment in patients with extraperitoneal bladder rupture.