## Laryngeal Papillomatosis — Site Distribution **Key Point:** The anterior commissure and subglottic region are the most common sites of involvement in recurrent respiratory papillomatosis (RRP), followed by the true vocal cords. ### Anatomical Predilection The anterior commissure is a natural site of pooling of secretions and has reduced mucociliary clearance, making it vulnerable to HPV infection and papilloma growth. The subglottic region, being the narrowest part of the larynx, also favors papilloma accumulation. ### Sites of RRP — Frequency Ranking | Site | Frequency | Clinical Significance | |------|-----------|----------------------| | Anterior commissure | Most common | Highest recurrence; difficult to treat | | Subglottic region | Very common | Associated with airway obstruction | | True vocal cords | Common | Causes hoarseness | | False vocal cords | Uncommon | Usually secondary involvement | | Posterior larynx | Rare | Atypical presentation | ### Clinical Pearl Involvement of the anterior commissure is associated with worse prognosis and higher recurrence rates because: - Reduced blood supply limits drug penetration - Difficult surgical access - Pooling of secretions harbors virus **High-Yield:** The anterior commissure is the **"danger zone"** in RRP management — papillomas here are most likely to recur and require aggressive, repeated treatment. [cite:Cummings Otolaryngology 6e Ch 88]
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