<prompt> Squamous cell carcinoma of esophagus mc site -Upper 13rdMiddle 13rdLower 1 3rdLower end of esophagus  <response>: Ans. is b i.e., Middle 13rd o Esophageal Carcinoma is of two common histological types:-Squamous cell Ca - the MC type in worldAdenocarcinoma - where incidence is increasing at a rapid rate and is now the MC type in USA.o Distribution of Squamous Cell Ca. Upper 13-10 Middle 13-60 Lower 13-30 o Adenocarcinoma is mainly located in lower 13.o So remember MC type of esophageal Ca in world-Squamous Cell Ca MC site-Middle 13 MC site of adenocarcinoma esophagus-Lower 13 