<prompt> Most common site of carcinoid in gut is ?EsophagusAppendixIleumRactum  <response>: Ans. is c i.e., IleumCarcinoid tumoro Carcinoid tumors arise from the neuroendocrine cells.o The majority are found in GI tract, and more than 40 in small intestine jejunum o The tracheobronchial tree and lungs are the next common sites involved.Features of gastrointestinal carcinoid tumorsFeatureEsophagusStomachProximalJejunum andAppendixColorectum DuodenumIleum Fraction of GI11010402525Carcinoids Mean patientage yrRare555065All ages60LocationDist!Body and fundusProximal third,peri-ampullaryThroughoutTipRecturcecumSizeLimited data1-2 cm, multiple;0.5-2 cm3.5 cm0.2-1 cm5 cm cecum; 2 cm, solitary 1 cm rectumSecretoryproductsLimited dataHistamine,somatostatin,serotoninGastrin,somastostatin,cholecystokininSerotonin,substance P,polypeptide YYSerotonin,polypeptideYYSerotonin,polypeptideYYSymptomsDysphagia,weight loss,refluxGastritis, ulcer,incidentalPeptic ulcer, biliaryobstruction,abdominal painAsymptomatic,obstruction,metastaticdiseaseAsymptomatic,incidentalAbdominal pain,weight loss,incidental 