A 58-year-old male with laryngeal stenosis post-tracheostomy (performed 3 months ago) presents with progressive dyspnea and stridor. Which investigation is most appropriate to assess the severity and extent of stenosis before planning definitive management?

## Investigation of Choice for Laryngotracheal Stenosis Assessment ### Why High-Resolution CT with 3D Reconstruction? **High-Yield:** CT with 3D reconstruction is the gold standard for preoperative assessment of laryngotracheal stenosis because it provides: - Precise anatomical delineation of the stenotic segment (length, location, degree of narrowing) - Assessment of the subglottic region and trachea simultaneously - Evaluation of the luminal diameter and cross-sectional area - Detection of associated complications (tracheomalacia, granulation tissue) - Surgical planning data (whether stenosis is amenable to endoscopic vs. open reconstruction) **Key Point:** CT imaging allows non-invasive quantification of stenosis severity using the Cotton-Myer grading system parameters (percentage of luminal narrowing), which guides treatment decisions. ### Comparison of Investigation Modalities | Investigation | Advantages | Limitations | |---|---|---| | **High-resolution CT + 3D** | Precise anatomy, surgical planning, non-invasive, detects complications | Radiation exposure, cost | | **Flexible laryngoscopy** | Office-based, direct visualization, safe | Cannot assess subglottic/tracheal extent, no quantification, operator-dependent | | **Plain X-ray neck** | Quick, low cost | Poor soft tissue detail, cannot assess luminal narrowing accurately, limited value | | **Rigid bronchoscopy** | Direct visualization, therapeutic option | Invasive, general anesthesia required, risk of further trauma, not first-line diagnostic | **Clinical Pearl:** While flexible laryngoscopy is useful for initial assessment and diagnosis, CT imaging is mandatory before definitive surgical planning to avoid intraoperative surprises and to counsel the patient on prognosis. **Warning:** Rigid bronchoscopy should not be the first investigation for diagnosis—it is reserved for therapeutic intervention (laser-assisted endoscopic dilation) or when CT findings are inconclusive and direct visualization under anesthesia is needed for staging.