In this cohort study of 63 Korean patients who had confirmed moderate or severe obstructive sleep apnea (OSA) with lateral pharyngeal wall collapse, Hong et al determined whether correction of the collapse by expansion sphincter pharyngoplasty was associated with a successful outcome using objective measures of sleep quality. They found that a significant proportion of study participants had successful outcomes and improved sleep quality. They conclude that expansion sphincter pharyngoplasty may reduce lateral pharyngeal collapse in patients with moderate or severe OSA and palatal circumferential narrowing with bulky lateral pharyngeal tissue.