<prompt> Common type of Ca in middle 3rd of oesophagus?Adeno CaSquamous CaAdeno squamous CaLeiomyosarcoma  <response>: Ans. is b i.e., Squamous cell carcinomaEsophageal carcinoma is of two common histological types -1.Squamous cell carcinomao Most common type world wide. o Most common type in India.o Occurs in upper and middle 13 of esophagus.2. Adenocarcinomao Most common type in USA.o Located in the lower 3rd of esophagus. 