Intraluminal supraglottic lesion presenting with stridor: an unlikely pathology

A 37-year-old man presented to the ENT outpatient clinic with progressive dysphagia and breathlessness on exertion for a year. The patient was tachypnoeic, with mild inspiratory stridor and orthopnoea. The neck had a generalised swelling, but no mass was clinically palpable. Indirect laryngoscopy