## Most Common Site of Laryngotracheal Foreign Body Lodgement **Key Point:** The subglottic region, immediately below the vocal cords, is the most common site of foreign body impaction in children due to the natural anatomical narrowing at this level. ### Anatomical Basis The larynx and trachea have several areas of relative narrowing: | Site | Anatomical Feature | Frequency of FB Impaction | | --- | --- | --- | | **Subglottic region** | Narrowest part of pediatric airway (funnel-shaped) | **Most common (60–70%)** | | Anterior commissure | Anterior laryngeal narrowing | Uncommon | | Posterior larynx | Arytenoid region | Rare | | Carina | Bifurcation of trachea | More common in lower respiratory tract | **Clinical Pearl:** The subglottic narrowing is more pronounced in children than adults because the pediatric larynx is funnel-shaped, whereas the adult larynx is cylindrical. This anatomical difference explains why subglottic foreign bodies are predominantly a pediatric problem. ### Why Subglottic? 1. **Narrowest point** — The cricoid cartilage forms the narrowest part of the pediatric airway 2. **Turbulent airflow** — Creates a "catch point" for aspirated objects 3. **Gravity and airflow dynamics** — Foreign bodies tend to lodge at points of maximum resistance **High-Yield:** In any child presenting with stridor and suspected foreign body aspiration, the subglottic region should be the first site examined on direct laryngoscopy. **Mnemonic:** **SUBGLOTTIC FUNNEL** — Subglottic narrowing is the Funnel-shaped narrowest part in pediatric airways, making it the most common lodgement site. 
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