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Occult spontaneous pneumothorax

Case contributed by Safwat Mohammad Almoghazy
Diagnosis certain

Presentation

Known case of Marfan syndrome presented with right shoulder pain. No history of trauma.

Patient Data

Age: 25 years
Gender: Male

At presentation

x-ray

Classic appearances of right-sided pneumothorax with a readily apparent visceral pleural line.

PA view CXRy on day 5

x-ray

In the fontal chest radiographic image diagnosis of right-side pneumothorax, the visceral pleural line is seen without distal lung markings.

Post drainage tube insertion

x-ray

A large-bore chest drain satisfactorily placed.

Case Discussion

This case came to causality by right shoulder pain and a shoulder radiograph was performed. 5 days later they presented with chest pain and it was an incidental diagnosis of a large right pneumothorax.

The correct interpretation of radiograph and knowledge of when to request more complex imaging techniques are essential.

The radiographic diagnosis of pneumothorax is usually straightforward - a visceral pleural line is seen without distal lung markings.

The British Thoracic Society guidelines divide pneumothoraces into small and large based on the distance from the visceral pleural surface (lung edge) to the chest wall, with less than 2 cm being small and more than 2 cm large. A large pneumothorax is an objective indication of drainage.

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