Glottal Insufficiency and Parkinson's Disease: A Scoping Review of Vocal Fold Medialization Procedures.

Objectives/hypothesis: Vocal impairments are early and debilitating symptoms of Parkinson's disease (PD). Glottal insufficiency is a contributor to PD-related dysphonia. Vocal fold injection laryngoplasty (IL) and medialization thyroplasty (MT) are well-established techniques used to restore glottal closure for a range of causes.