laparoscopic heller myotomy procedure cardiomyotomy. surgery for dysphagia

laparoscopic heller myotomy procedure cardiomyotomy surgery dysphagia hellers esophagogastric janction diagram organ anatomical tunnel gastric illustration diagnostic gastroesophageal diagnosis esophagus endoscope cancer disorder dilation endoscopic heartburn esophagectomy endoscopy botulinum peroral disease sphincter stricture reflux muscle examination toxin pneumatic nutcracker achalasia spastic dilatation obstruction esophageal treatment system gastrointestinal difficulty