What is the most likely diagnosis?
- 53 year-old man with neck pain following fall

Axial CT Images of Trachea
- Thyroid Cyst
- Zenker's Diverticulum
- Pneumomediastinum
- Paratracheal Air Cyst
- Mounier-Kuhn Syndrome
Additional Image - Sagittal Reconstruction of Trachea

Additional Images

Sagittal Reconstruction of Trachea

Answer:
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4. Paratracheal Air Cyst
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More (Click Discussion Tab)
Paratracheal Air Cysts
General Considerations
- Benign incidental finding on CT (rarely seen on chest radiographs)
- 2.0% to 3.7% of the population
- Most are probably tracheal diverticulum
- On imaging, 35% have a narrow stalk to the trachea
- Histology shows ciliated columnar epithelium
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