<prompt> M.C. site of CA oesophagus is -Middle 13rdUpper 13rdLower 13rdLower end of esophagus  <response>: Esophageal Carcinoma is of two common histological typesSquamous cell Ca - the MC type in the world -95 according to SabistonAdenocarcinoma - where incidence is increasing at a rapid rate and is now the MC type in the USA Ref: Harrison, SchwartzDistribution of Squamous Cell Ca.Upper 13 10Middle 13 60Lower 13 30 Adenocarcinoma is mainly located in lower 13.Nowhere, I could get the MC site of esophageal carcinoma overall including both squamous and adeno variety. But one thing is sure - squamous cell Ca is the MC type of esophageal cancer in the world So I presume that the overall MC site would be the MC site involved by the MC type of esophageal cancer i.e. Middle 13So rememberMC type of esophageal Ca in world Squamous Cell Ca -95 MC site Middle 13 