A 60-year-old male patient visits his primary care physician complaining of difficulty swallowing (dysphagia). He reports that over the past several months, he has experienced progressive difficulty in swallowing solid foods, and he often feels like food is getting stuck in his chest. The patient has also unintentionally lost weight over this period. The patient has a past medical history of gastro-oesophageal reflux disease (GORD).