<prompt> Most common site for squamous cell carcinoma of esophagus isUpper 13Middle 13Lower 13Upper 12  <response>: Ans. is b i.e., Middle 13 Esophageal Carcinoma is of two common histological typesi Squamous cell Ca - the MC type in world -95 according to Sabistonii Adenocarcinoma - where incidence is increasing at a rapid rate and is now the MC type in USA Ref: Harrison, Schwartz Distribution of Squamous Cell Ca. Upper 13 - 10 Middle 13 - 60 Lower 13 - 30 Adenocarcinoma is mainly located in lower 13. 