## Investigation of Choice for Laryngeal Carcinoma Diagnosis ### Role of Rigid Laryngoscopy with Biopsy **Key Point:** Rigid laryngoscopy under general anesthesia with tissue biopsy is the gold standard for diagnosis and staging of laryngeal carcinoma. It provides superior visualization, allows simultaneous biopsy for histopathological confirmation, and enables assessment of subglottic extension and anterior commissure involvement. ### Why Rigid Over Flexible Laryngoscopy - **Tissue sampling:** Rigid scope allows controlled, adequate biopsy specimens under direct visualization and anesthesia - **Subglottic assessment:** Better visualization of anterior commissure and subglottic extension — critical for T staging - **Hemostasis control:** Easier management of bleeding during biopsy - **Diagnostic yield:** Higher quality samples compared to flexible approach ### Imaging Role (CT/MRI) | Investigation | Role | Timing | | --- | --- | --- | | **Rigid laryngoscopy + biopsy** | Diagnosis + local staging | **First-line** | | **CT larynx** | Assess bony invasion, cartilage involvement | After diagnosis confirmed | | **MRI larynx** | Soft tissue detail, cord mobility assessment | Staging, not diagnosis | | **Flexible laryngoscopy** | Screening/surveillance, not diagnostic biopsy | Office setting, limited tissue yield | **Clinical Pearl:** The combination of rigid laryngoscopy with biopsy AND imaging (CT/MRI) is used together — rigid scope confirms diagnosis histologically; imaging assesses extent for TNM staging and treatment planning. **High-Yield:** Biopsy is MANDATORY before any treatment decision. Never treat based on clinical appearance alone — must have histopathological confirmation of malignancy. ### Mnemonic for Laryngeal Cancer Workup **RIB** = **R**igid scope + **I**maging + **B**iopsy (in that priority order for diagnosis) 
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