Following is true about bronchial carcinoids -: (A) Highly radiosensitive, (B) Metastasis common, (C) Carcinoid syndrome does not manifest, (D) Commonly arise from terminal bronchioles
Answer is C. Ans. is 'c' i.e., Carcinoid syndrome does not manifest Bronchial carcinoid o Most patients < 40 years o Not related to smoking o Most tumors are confined to main stem bronchi and commonly project into lumen. Some tumors penetrate the bronchial wall to fan out in the peri-bronchial tissue producing the collar-button lesion. o Most bronchial carcinoids :Do not have secretory activity. Do not metastasize to distant sites (follow a benign course for long periods). Are amenable to resection. o Most common presentation is intraluminal growth which can cause cough, hemoptysis, secondary infections, bronchiectasis, emphysema and atelectasis. o Though very rare, some bronchial carcinoids may also present : i) Carcinoid syndrome ( due to release of vasoactive amines) :- Flushing, diarrhea, cyanosis ii) Symptoms due to metastasis.