 The entire esophageal mucosa was examined as the esophagoscope was backed out and there was only a minimal amount of superficial ulceration in the posterior wall of the esophagus near the level of the cricopharyngeus muscle. 
The entire esophageal mucosa was examined as the esophagoscope was backed out and there was only a minimal amount of superficial ulceration in the posterior wall of the esophagus near the level of the cricopharyngeus muscle .