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2. Gallstones (2nd line, if diagnosis still unsure)
3. Intestinal obstruction (gold standard for diagnosis)
6. Colorectal cancer (1st line for diagnosis)
8. Volvulus (to confirm diagnosis)
13. Acute cholangitis (if caused by gallstones)
15. Colorectal cancer (1st line for staging)
17. Acute cholangitis (if not caused by gallstones)
18. Intestinal obstruction (1st line)