Carcinoid tumour of the appendix is most commonly located at the tip of the appendix and is the most common primary appendiceal tumour. Simple appendicectomy is curative for carcinoid tumours less than which diameter?
- A 1 cm
- B 2 cm ✓
- C 3 cm
- D 1.5 cm
Correct answer: B. 2 cm
Explanation
Appendiceal carcinoid (now classified as well-differentiated neuroendocrine tumour, NET) behaves according to tumour size. Lesions <2 cm in diameter have an extremely low risk of metastasis (<2%) and are adequately treated by simple appendicectomy. Tumours ≥2 cm carry a significantly higher risk (approximately 30%) of regional lymph node or hepatic metastases and require formal right hemicolectomy. Tumours at the base of the appendix involving the mesoappendix also require hemicolectomy regardless of size.
Reference: Bailey & Love's Short Practice of Surgery, 27th ed.
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