Review Question - QID 212497

A 32-year-old man presents to his primary care physician for trouble with swallowing. The patient states that he can only chew and swallow a very small amount of food, and sometimes he regurgitates it back up. His current medications include a multivitamin, fish oil, and whey protein supplements. His temperature is 99.5°F (37.5°C), blood pressure is 120/77 mmHg, pulse is 60/min, respirations are 10/min, and oxygen saturation is 97% on room air. On physical exam, the patient's cardiac and pulmonary exams are within normal limits. His abdominal exam reveals a non-distended abdomen with no tenderness in all four quadrants and normal bowel sounds. A barium swallow is performed as seen in Figure A. Which of the following is the best next step in management?