Which is the commonest site of laryngeal papillomatosis in children?

Explanation

## Laryngeal Papillomatosis: Site Distribution **Key Point:** Recurrent respiratory papillomatosis (RRP) in children most commonly affects the anterior commissure and anterior larynx, with the anterior commissure being the single most frequent site of initial and recurrent lesions. ### Anatomical Predilection The anterior commissure is the commonest site because: 1. **Embryological origin** — The larynx develops from the laryngeal inlet, and the anterior commissure represents a natural confluence point where viral particles may preferentially lodge. 2. **Airflow dynamics** — Turbulent airflow at the anterior commissure creates a microenvironment favorable for HPV persistence. 3. **Epithelial characteristics** — The anterior larynx has a thin, non-keratinized mucosa with higher viral susceptibility. ### Site-Specific Frequency in RRP | Site | Frequency (%) | Clinical Significance | | --- | --- | --- | | Anterior commissure | 60–70 | Most common; highest recurrence | | False vocal cords | 40–50 | Second most common | | True vocal cords | 30–40 | Affects phonation | | Posterior larynx | 10–20 | Less common | | Subglottic region | 5–10 | Rare; associated with airway obstruction | **Clinical Pearl:** Anterior commissure involvement is significant because: - It is the site of highest recurrence after treatment - Scarring here leads to anterior glottic webs, causing voice changes - It requires careful endoscopic management to avoid iatrogenic web formation **High-Yield:** In NEET PG, when asked about RRP sites, always think **anterior commissure** as the primary answer. The posterior commissure and interarytenoid region are much less commonly involved. ### Why Other Sites Are Less Common - **Posterior commissure:** Protected by posterior laryngeal anatomy; less exposed to airflow turbulence. - **Interarytenoid region:** Keratinized mucosa is more resistant to HPV infection. - **Subglottic region:** Subglottic papillomas are rare and usually occur as extension from supraglottic disease; they are clinically significant because they can cause airway obstruction but are NOT the commonest site of origin. [cite:Gray's Anatomy 42e, Head and Neck Ch]