## Investigation of Choice for Laryngeal Carcinoma Diagnosis **Key Point:** Direct laryngoscopy with tissue biopsy is the gold standard for definitive diagnosis of laryngeal carcinoma. Histopathological confirmation is mandatory before initiating treatment. ### Why Direct Laryngoscopy with Biopsy? 1. **Provides tissue diagnosis** — only method that yields histology for squamous cell carcinoma confirmation 2. **Allows assessment of extent** — permits evaluation of subglottic extension, anterior commissure involvement, and false vocal cord involvement under magnification 3. **Guides treatment planning** — determines whether lesion is amenable to laser microsurgery, radiation, or open partial laryngectomy 4. **Gold standard** — universally accepted as the definitive diagnostic modality [cite:Dhingra 8e Ch 12] ### Role of Other Investigations | Investigation | Role | Limitation | |---|---|---| | Flexible fiberoptic laryngoscopy | Initial screening, office-based visualization | Cannot obtain biopsy; only for assessment | | CT larynx | Staging (T, N, M); bone erosion, cartilage invasion | Does not provide histology; cannot diagnose without biopsy | | MRI neck | Soft tissue detail, perineural spread assessment | Not for primary diagnosis; staging modality | **High-Yield:** Biopsy is NEVER omitted. Even if imaging is highly suggestive of malignancy, histological confirmation is mandatory before commencing chemotherapy or radiation. **Clinical Pearl:** During direct laryngoscopy, the surgeon also assesses: - Mobility of vocal cords (fixed = advanced disease) - Involvement of anterior commissure (poor prognosis) - Subglottic extension (affects surgical approach) - Contralateral vocal cord status **Warning:** ~~Flexible laryngoscopy alone~~ is insufficient for diagnosis — it is a visualization tool only. Biopsy requires rigid endoscopy and instrumentation. 
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