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Technique: Helical CT scan of the abdomen and pelvis was performed without contrast. Multiplanar reformations were performed.

Findings: An elongate foreign body measuring 23 x 4 cm is visible in the sigmoid colon. The foreign body is composed of homogenous low-density material and contains 3 internal elongate gas density regions. Distal aspect of the foreign body is in the upper rectum at the level of S4
and S5. There is no evidence of intestinal obstruction, proximally the bowel is normal in caliber. There is no fluid collection and no pneumoperitoneum.

Retroaortic left renal vein is a normal venous variant.
No focal lesions of the liver, spleen, pancreas, kidneys or adrenal glands are evident.
Lymph nodes are normal in size.
Aortic caliber is normal.
Skeletal structures appear normal.

Large intraluminal foreign body in the sigmoid colon, without CT evidence of bowel injury.