A 64-year-old man comes to the physician because of three episodes of regurgitating undigested food after meals for the past 3 months. He sometimes has a vague sensation of food sticking in his throat and gurgling when swallowing. Rhonchi are heard over the right lower lobe. BMI is 35. Which of the following is most likely to be seen in this patient?
Cricopharyngeal muscle spasm
Fibrosis and atrophy of esophageal smooth muscle
Loss of neurons of myenteric plexus
Metaplasia of distal esophagus
Spasm of esophageal muscles
