system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
M.C. site of Ca esophagus is
assistant
The correct answer is  tumors of oesophagus usually occurs in distal third of oesophagus and may invade gastric cardia ROBBINS TEXT BOOK OF PATHOLOGY 9TH EDITION PD NO.662