• Timothy M Guenther, Joshua D Gustafson, Shea M Pribyl, and Curtis J Wozniak.
• Department of Surgery, University of California Davis, 2315 Stockton Blvd, Sacramento, CA 95817.
• Mil Med. 2020 Sep 18; 185 (9-10): e1833-e1835.

AbstractPneumothorax is a condition where air exists in the chest cavity, outside the lung. The causes of pneumothorax are numerous and determining the etiology can aid in treatment and prevent recurrence. We describe a 47-year-old female patient with past medical history of endometriosis who presented to the emergency room with recurrent right sided pneumothorax, its onset correlating with onset of menses. She underwent video assisted thorascopic surgery for a suspected catamenial pneumothorax whereby nodular "chocolate" appearing areas were noted on the middle lobe and multiple similar appearing lesions and fenestrations were noted on the diaphragm. A biologic mesh was affixed to the diaphragm after which mechanical and chemical pleurodesis were performed. She tolerated the procedure well and has been symptom free since. Herein, we review the pathophysiology, diagnosis, and treatment strategies for catamenial pneumothorax in the hopes of increasing awareness and understanding of this rare cause of spontaneous pneumothorax.Published by Oxford University Press on behalf of the Association of Military Surgeons of the United States 2020.

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