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What is A 30 yr old man undergoes emergency laparotomy following penetrating injury to abdomen. Coincidentally surgeon notices a 2cm mass at the tip of appendix. It is yellowish brown in colour and firm to touch. IHC is positive for chromogranin  and synaptophysis, negative for ki67. which of the following could be the possible diagnosis ? and explain in detail?
The given case scenario is indicating carcinoid tumor. it is a neuroendocrine tumor.