Fish bone migration to the urinary bladder after rectosigmoid colon perforation

Figure 1 Initial computed tomography image. A, B: Computed tomography revealed a 3 cm, thin, curvilinear object with a high density within a 5 cm sized fluid collection adjacent to the urinary bladder, which can be regarded as a foreign body and abscess formation (arrow); C: Wall of the rectosigmoid colon (arrow) is thickened, suggesting that the rectosigmoid colon was perforated.

Figure 2 Follow up computed tomography image after the patient developed mechanical ileus. A: One month before the operation. Follow up computed tomography (CT) demonstrated a transitional zone at the distal ileum near the pelvic abscess, with small bowel dilatation; B: Seven day before the operation. Follow-up CT showed a linear, radiopaque lesion that was partially penetrated into the dome of the bladder.

Figure 3 Cystoscopic view. A yellowish, linear structure was seen between the dome and the lateral wall of the urinary bladder.