Review Question - QID 211026

A 62-year-old man comes to the office complaining of dysphagia that started 4 months ago. He initially had difficulty swallowing only solid foods. More recently, he has noticed some trouble swallowing liquids. The patient also complains of fatigue, a chronic cough that worsens at night, and burning chest pain that occurs after he eats. He has used over-the-counter antacids for “years” with mild relief. He denies any change in diet, but says he has lost weight. The patient has hypertension and hyperlipidemia. He takes amlodipine and atorvastatin. He smoked 1 pack of cigarettes a day for 12 years while in the military but quit 35 years ago. He drinks 1-2 beers on the weekend while he is golfing with his friends. His diet consists mostly of pasta, pizza, and steak. The patient's temperature is 98°F (36.7°C), blood pressure is 143/91 mmHg, pulse is 80/min, respirations are 12/min, and oxygen saturation is 98% on room air. His BMI is 32 kg/m^2. Physical examination reveals an obese man in no acute distress. No masses or enlarged lymph nodes are appreciated upon palpation of the neck. A cardiopulmonary examination is unremarkable. An endoscopy is performed, which identifies a lower esophageal mass. Which of the following is the most likely diagnosis?