Most common site for carcinoid tumour is?

Appeared in: PGIMS Rohtak NO - 2017

Explanation

The appendix is the most frequently reported site for gastrointestinal (GI) carcinoid tumors.
These tumors arise from neuroendocrine cells and are often discovered incidentally during an appendectomy performed for suspected appendicitis.
Appendiceal carcinoids are typically small (less than 2 cm), solitary, located at the tip of the appendix, and have a low potential for metastasis.

Option A: The duodenum is a less common site for carcinoid tumors. It is considered a 'foregut' location, which accounts for only about 10-20% of GI carcinoids.
Option B: The jejunum, like the duodenum, is part of the foregut/midgut junction and is an infrequent site for carcinoid tumors compared to the appendix and ileum.
Option C: Although the ileum is a very common site for carcinoid tumors, it is generally considered the second most common site after the appendix.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Epidemiology and common locations of carcinoid tumors in the gastrointestinal tract as background academic context rather than a clinical decision trigger.
Nurses play a key role in managing patients with carcinoid tumors, particularly in monitoring for carcinoid syndrome (flushing, diarrhea, wheezing) which can significantly impact quality of life.
Accurate patient education for diagnostic tests like the 24-hour urine 5-HIAA is crucial. This includes explaining dietary restrictions (avoiding serotonin-rich foods like bananas, walnuts, avocados) to ensure test accuracy.
In the perioperative setting, nurses must be prepared for a potential carcinoid crisis, a medical emergency. This involves having octreotide readily available and avoiding triggers like certain anesthetic agents.

How to Approach the Question

This is a factual recall question that tests your knowledge of gastrointestinal pathology.
First, identify the key terms in the question: 'carcinoid tumour' and 'most common site'.
Access your knowledge base on the epidemiology of neuroendocrine tumors of the GI tract.
Recall that these tumors can occur anywhere along the gut but have specific sites of predilection.
Remember that the appendix is the most frequently cited location, often found incidentally.
Differentiate this from the ileum, which is the second most common site but is more clinically significant due to a higher risk of metastasis and carcinoid syndrome. Since the question asks for the 'most common site' overall, the appendix is the best answer.

Concept Tested & Keywords

Concept Tested: Epidemiology and common locations of carcinoid tumors in the gastrointestinal tract.
Stem keywords: carcinoid tumour, most common site
Lead-in keywords: is?

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E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 196-198

Practise the full PGIMS Rohtak NO - 2017

Attempt every question from this paper in a timed mock, then review the full solution for each one.