Presentation
Knocked from bike. Sore left shoulder.
Patient Data
Age: 25 years
Gender: Female
From the case:
Pneumothorax on shoulder x-ray
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Frontal

No dislocation. AC joint is not widened. No fracture identified. Left apical pneumothorax.
Case Discussion
The lungs are a check area on shoulder x-rays. Pneumothorax is a well known cause of shoulder tip pain due to diaphragmatic irritation.