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2. Colorectal cancer (1st line for diagnosis)
8. Intestinal obstruction (1st line)
9. Gallstones (2nd line, if diagnosis still unsure)
11. Acute cholangitis (if not caused by gallstones)
12. Volvulus (to confirm diagnosis)
13. Acute cholangitis (if caused by gallstones)
14. Colorectal cancer (1st line for staging)
16. Intestinal obstruction (gold standard for diagnosis)