MSFinals-1200

MSFinals-1200

A 38-year-old man presents with a one-month history of feeling a lump in his throat. The feeling comes and goes and has not progressed. He has no difficulty swallowing food or liquids; in fact, eating and drinking help to relieve the symptoms. He has not lost weight. He is a non-smoker. He was recently diagnosed with gastro-oesophageal reflux disease (GORD) and is taking a proton pump inhibitor. He also has chronic sinusitis, for which he takes a steroid nasal spray.
Examination is normal, without cervical lymphadenopathy.
What is the most likely diagnosis in this case?