Carcinoid tumours are most commonly found in the gastrointestinal tract and which other organ?

Carcinoid tumours are most commonly found in the gastrointestinal tract and which other organ?

• A. Liver
• B. Lungs
• C. Brain
• D. Skin

Answer: (B)

Carcinoid tumors are a type of neuroendocrine tumor that most often arise in the gastrointestinal tract because enterochromaffin cells are abundant there. The next most common primary site is the lungs, where neuroendocrine cells in the bronchial epithelium can give rise to bronchial carcinoids. This is why the lungs are the best answer: after the GI tract, the bronchopulmonary region is the most frequent location for these tumors. The liver, brain, and skin are not typical primary sites for carcinoids, though metastasis to the liver can influence symptoms.

Carcinoid tumors are a type of neuroendocrine tumor that most often arise in the gastrointestinal tract because enterochromaffin cells are abundant there. The next most common primary site is the lungs, where neuroendocrine cells in the bronchial epithelium can give rise to bronchial carcinoids. This is why the lungs are the best answer: after the GI tract, the bronchopulmonary region is the most frequent location for these tumors. The liver, brain, and skin are not typical primary sites for carcinoids, though metastasis to the liver can influence symptoms.