
Objective: To present a case of catamenial pneumothorax and diaphragmatic endometriosis that was managed thoracoscopically. A review of the literature is also presented. A 28-year-old woman initially presented with bloody stools and chronic constipation. During a review of systems, the patient described monthly chest pain associated with her menses. The initial workup included a pre-operative chest x-ray that revealed a right pneumothorax and colonoscopy that revealed biopsy-proven endometriosis of the sigmoid colon.