More than 90 percent of cases of pleural endometriosis are on the right side. Often small holes are in the diaphragm, the muscular membrane that separates the abdominal and thoracic cavities. Most patients with pleural endometriosis also have pelvic endometriosis. One theory is that endometriosis travels through the small holes in the diaphragm. When endometriosis is in the pleural tissue, the most common symptoms are l Difficulty breathing l Pain l Pain with breathing motions l Pneumothorax (collapsed lung) l Pleural effusion (fluid on the lung) l Shortness of breath
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