A common type of Ca in middle 3rd of the esophagus-: (A) Adeno Carcinoma, (B) Squamous Carcinoma, (C) Adeno squamous Carcinoma, (D) Leiomyosarcoma
Answer is B. Esophageal carcinoma is of two common histological types -
1. Squamous cell carcinoma

Most common type worldwide.
Most common type in India.
Occurs in upper and middle 1/3rd of esophagus.

2. Adenocarcinoma

Most common type in the USA.
Located in the lower 1/3rd of esophagus.