a 49-year-old man presented with gradual onset of dysphagia with aspiration symptoms. The neck CT showed a giant cyst on the lingual surface of the epiglottis. Which of the following tests would be considered the gold-standard method of investigating this patient’s problem? 1) Ultrasound 2)MRI of the neck 3)Videofluoroscopic swallowing study 4)Gastrofiberscopy