Appendix cancer for emergency physicians.
Some appendicitis is a perforated appendiceal tumor. The appendix should reach pathology.
Most appendicitis is just appendicitis. But a small share hides a mucinous neoplasm, and the emergency department is often where the story starts. You do not need to diagnose appendix cancer in the ED. You need to make sure the cases that could be one are not closed out in a way that hides them.
Clues it may not be ordinary appendicitis
Raise your index of suspicion with older age, a first presentation later in life, or imaging that shows a cystic right-lower-quadrant mass or a dilated, mucin-filled appendix rather than simple inflammation. A mucocele on CT, curvilinear wall calcification, or a walled-off collection are worth naming in your note, not waving through as appendicitis.
Antibiotics-only leaves nothing to examine
Antibiotics-first is a reasonable strategy for uncomplicated appendicitis, but it comes with a tradeoff worth remembering. No appendix is removed, so no specimen reaches pathology, and an underlying tumor can sit unrecognized. When imaging or the clinical picture is atypical, that tradeoff matters. Appendectomy provides the tissue that settles the question.
The move that matters: pathology
The single most useful thing the ED can do is make sure a suspicious appendix is examined and that concerning imaging is communicated clearly at handoff. A mucocele read on CT should be flagged for surgical follow-up, not buried in the report. Findings lost between the ED and the next clinician are how these tumors slip through.
A note on standards
Management of confirmed appendiceal tumors follows the 2025 appendiceal consensus guideline, not colorectal protocols, and is centered at peritoneal surface malignancy programs. This guide is a practical orientation for the emergency setting, not a substitute for local pathways and surgical judgment.
Flagged something suspicious?
Point the receiving team to the referral pathway so an atypical appendix reaches the right specialists.
How to Refer a Patient Standard of Care