Determine the most appropriate definitive surgical or procedural management for each of the following gastrointestinal and colorectal pathologies.
- A 2.5-cm neuroendocrine (carcinoid) tumor located at the base of the appendix.Right hemicolectomy
- A 0.8-cm neuroendocrine (carcinoid) tumor located at the tip of the appendix without mesoappendiceal involvement.Simple appendectomy
- Familial adenomatous polyposis (FAP) with hundreds of colonic adenomas and severe dysplasia in the rectum.Total proctocolectomy with ileal pouch-anal anastomosis
- A completely excised pedunculated colonic polyp showing carcinoma in situ (high-grade dysplasia) with a 3-mm clear margin.Colonoscopy surveillance without further colonic resection
Answer
Tumors >2 cm or at the appendiceal base mandate right hemicolectomy. Tumors <1 cm at the tip require only appendectomy. FAP with severe rectal dysplasia requires total proctocolectomy. Completely excised carcinoma in situ requires only routine colonoscopy surveillance.
The appropriate surgical management of these gastrointestinal pathologies relies on accurately assessing the risk of metastasis or future malignancy. Appendiceal tumors >2 cm or at the base have high metastatic potential, requiring a right hemicolectomy. Small (<1 cm) tip tumors do not require extended resection. FAP with rectal dysplasia guarantees future cancer without total proctocolectomy. Carcinoma in situ cannot metastasize, making endoscopic resection sufficient.
Step-by-Step Solution
Key Concept
Definitive surgical management of appendiceal neuroendocrine tumors, familial adenomatous polyposis, and malignant colonic polyps.