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Figure 6. False positive diagnosis of appendicitis in a 50-year-old male with abdominal pain. Contrast administered only per rectum. Note apparent focal thickening of base of caecum (black arrow), with tubular thickened structure appearing to extend from it (large white arrow), separate from terminal ileum (not shown). Surgery demonstrated no evidence of appendicitis. Use of oral contrast medium may have prevented this false positive diagnosis.

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