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What is the cause of catamenial pneumothorax
While the exact mechanism is no fully understood, it is generally thought to be related to endometrial deposits from endometriosis seeding through a diaphragmatic defect or fenestration. In this case the small nodule seen on CT is thought to be responsible.
A pleural based 3 mm nodule in the lateral segment of the right upper lobe (image 115) is noted.
No endobronchial lesions are visualized.