A male patient in his thirties was referred with dysphagia lasting 8 years. He had a history of a laparotomy for a testicular tumor in his twenties. From an upper gastrointestinal contrast X-ray, he was diagnosed to have sigmoid-type achalasia (greatest transverse diameter, 80 mm). Hand-assisted laparoscopic Heller-Dor surgery was performed because straightening of the esophagus using only a laparoscope was diffi cult due to the marked curvature of the lower mediastinal part of the esophagus and the history of a laparotomy. The postoperative course was excellent; the patient was discharged on day 9. At present, his dysphagia has disappeared and oral intake is satisfactory. Marked improvement was also found on a timed barium esophagogram. In sigmoid-type achalasia, there are limitations to straightening of the lower esophagus, so the improvement of symptoms is frequently insufficient. The present surgical method allows overcoming these diffi culties and is very effective.