<prompt> A common type of Ca in middle 3rd of the esophagus-Adeno CarcinomaSquamous CarcinomaAdeno squamous CarcinomaLeiomyosarcoma  <response>: Esophageal carcinoma is of two common histological types -1. Squamous cell carcinomaMost common type worldwide.Most common type in India.Occurs in upper and middle 13rd of esophagus.2. AdenocarcinomaMost common type in the USA.Located in the lower 13rd of esophagus. 