A 58-year-old male smoker with a 3-month history of progressive hoarseness and dysphagia is found to have a left vocal cord lesion on laryngoscopy. Biopsy confirms squamous cell carcinoma. All of the following are appropriate components of staging and management EXCEPT:

Question

Accepted Answer

B. Laryngeal electromyography to assess vocal cord mobility and determine TNM staging. ## Staging and Management of Laryngeal Carcinoma

**Key Point:** Laryngeal EMG is a diagnostic tool for vocal cord paralysis (to differentiate true paralysis from fixation) but is NOT part of standard TNM staging or cancer workup. TNM staging relies on direct laryngoscopy findings, imaging, and pathology—not EMG.

### Standard Staging Investigations

| Investigation | Purpose | Role in Staging |
|---|---|---|
| Flexible laryngoscopy + biopsy | Diagnosis, extent of primary lesion | Determines T stage |
| CT chest/abdomen | Assess lung, liver, distant metastases | Determines M stage |
| CT/MRI neck | Assess lymph nodes, soft tissue invasion | Determines N stage |
| PET-CT | Detect occult nodal and distant disease | Improves staging accuracy |
| Laryngeal EMG | Assess vocal cord mobility (paralysis vs. fixation) | Diagnostic aid, NOT for TNM staging |

### Why Laryngeal EMG Is NOT Part of Cancer Staging

**Clinical Pearl:** EMG is used to differentiate vocal cord *paralysis* (abnormal EMG) from *fixation* (normal EMG with immobile cord). Fixed cords indicate advanced local disease (T3/T4) but the determination is made by direct laryngoscopy findings (immobility, invasion), not EMG.

**High-Yield:** EMG has a role in post-operative assessment (recurrent laryngeal nerve injury) and in benign paralysis workup, but it is NOT a standard component of laryngeal cancer staging.

**Warning:** Do not confuse EMG's diagnostic utility in paralysis with its role in oncologic staging. The TNM system relies on imaging, endoscopy, and pathology—not electrophysiology.

### Correct Staging Approach

```mermaid
flowchart TD
  A[Laryngeal lesion on exam]:::outcome --> B[Flexible laryngoscopy + biopsy]:::action
  B --> C[Confirm SCC]:::outcome
  C --> D[CT chest/abdomen + neck imaging]:::action
  D --> E[Assess T, N, M stages]:::outcome
  E --> F{High-risk features?}:::decision
  F -->|Yes| G[PET-CT for occult disease]:::action
  F -->|No| H[Proceed to treatment planning]:::action
  G --> I[Finalize staging]:::outcome
```

Answer

A. CT chest and abdomen to assess for distant metastases

Answer

C. Flexible fiberoptic laryngoscopy under local anesthesia for initial diagnosis and biopsy

Answer

D. Positron emission tomography for detection of occult nodal and distant metastases

A 58-year-old male smoker with a 3-month history of progressive hoarseness and dysphagia is found to have a left vocal cord lesion on laryngoscopy. Biopsy confirms squamous cell carcinoma. All of the following are appropriate components of staging and management EXCEPT:

Explanation

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