A Newborn With Stridor and Respiratory Distress

A female neonate was born with stridor and respiratory distress, which required intubation. Laryngoscopy and bronchoscopy revealed a large laryngeal mass that was soft and fluctuant on palpation. What is your diagnosis?
Source: JAMA Otolaryngology - Head and Neck Surgery - Category: ENT & OMF Source Type: research