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
The malignancy which is a close mimicker of achalasia is:
assistant
The correct answer is  The differential diagnosis of achalasia are DES Chagas' disease Pseudoachalasia Chagas' disease is spread by the bite of the reduvid (kissing) bug that transmits the protozoan, Trypanosoma cruzi. Tumor infiltration, most commonly seen with carcinoma in the gastric fundus or distal esophagus can mimic idiopathic achalasia and known as"pseudoachalasia". Nearly 5 % cases of suspected achalasia are pseudoachalasia. Ref: Harrison, Edition-18, Page-2431