A 28-year-old woman presents with a 2-week history of progressive dysphagia and throat discomfort. She denies any acute aspiration event. On examination, the larynx appears normal on indirect laryngoscopy, but she has persistent symptoms. Imaging is suspected to rule out a radiolucent foreign body or other pathology. Which investigation is most appropriate for visualizing a non-radiopaque foreign body in the hypopharynx and cervical esophagus?

Explanation

## Investigation of Choice for Suspected Radiolucent Foreign Body ### Clinical Context This patient presents with: - Subacute dysphagia (2 weeks) without acute aspiration history - Normal laryngoscopy (rules out laryngeal pathology) - Suspected foreign body that is likely **radiolucent** (not visible on plain X-ray) - Location: hypopharynx and cervical esophagus ### Why Barium Swallow with Videofluoroscopy is Correct **Key Point:** Barium swallow with videofluoroscopy is the gold standard for detecting radiolucent foreign bodies in the hypopharynx and cervical esophagus. **High-Yield:** Advantages of barium swallow: 1. **Contrast medium** coats the mucosa and outlines the foreign body, making radiolucent objects visible 2. **Dynamic visualization** during swallowing shows functional obstruction or dysmotility 3. **Real-time fluoroscopy** allows observation of the foreign body's movement and location 4. **Non-invasive** and safe in conscious patients without acute airway compromise 5. **Identifies complications** such as perforation (contrast extravasation) or stricture formation **Clinical Pearl:** Common radiolucent foreign bodies include plastic, wood, fish bones (initially), and food boluses. These are invisible on plain radiography but become visible when outlined by barium contrast. ### Diagnostic Accuracy Table | Investigation | Radiopaque FB | Radiolucent FB | Dynamic Assessment | Safety | |---|---|---|---|---| | Plain X-ray | ✓ Visible | ✗ Missed | ✗ No | ✓ Safe | | Barium swallow | ✓ Visible | ✓ Visible | ✓ Yes | ✓ Safe (if no perforation) | | Flexible laryngoscopy | ✗ Limited view | ✗ Limited view | ✗ No | ✓ Safe | | Ultrasound | ✗ Poor visualization | ✗ Poor visualization | ✗ No | ✓ Safe | **Mnemonic:** **BARIUM OUTLINES INVISIBLE** — Barium contrast outlines radiolucent (invisible on X-ray) foreign bodies. ### Workflow for Foreign Body Investigation ```mermaid flowchart TD A[Suspected foreign body]:::outcome --> B{Acute airway<br/>compromise?}:::decision B -->|Yes| C[Rigid bronchoscopy/<br/>Laryngoscopy]:::urgent B -->|No| D{Location?}:::decision D -->|Larynx/Trachea| E[Inspiratory/Expiratory<br/>Chest X-ray]:::action D -->|Hypopharynx/<br/>Esophagus| F[Plain X-ray first]:::action F --> G{Radiopaque?}:::decision G -->|Yes| H[Confirm with<br/>Barium swallow]:::action G -->|No| I[Barium swallow<br/>with fluoroscopy]:::action E --> J[Rigid bronchoscopy<br/>if positive]:::action I --> K[Flexible/Rigid<br/>esophagoscopy]:::action ``` **Precaution:** Barium swallow should be avoided if esophageal perforation is suspected (risk of barium mediastinitis). In such cases, water-soluble contrast (Gastrografin) is preferred.