Malignancy involving the gastroesophageal junction can present with features very similar to those of the primary achalasia. Faliure to identify such cases may delay effective treatment of a curable tumor. We report one patient with secondary achalasia resulting from the gastroesophageal junction tumor. The findings of the esophagography, and the esophageal manometry were consistent with primary achalasia. The esophagoscopy and the chest CT scan showed no evidence of a tumor. Medical management failed to relieve the symptoms, so he was operated, and was confirmed to have adenocancinoma at the gastroesophageal junction.