{Reference Type}: Case Reports {Title}: Pulmonary endometriosis: a rare cause of hydropneumothorax. {Author}: Alzayer H; {Journal}: Respirol Case Rep {Volume}: 7 {Issue}: 6 {Year}: Aug 2019 暂无{DOI}: 10.1002/rcr2.432 {Abstract}: Pulmonary involvement in endometriosis is well described in the literature but asymptomatic significant hydropneumothorax is considered an unusual presentation. It classically coincides with a menstrual cycle and can be a cause of recurrent disease. We present a young lady who was found to have an incidental asymptomatic right hydropneumothorax on a pre-employment health screen. She comes from an endemic area of tuberculosis, thus we pursued several diagnostic tests to rule it out. A diagnosis of catamenial hydropneumothorax was reached through a pleural biopsy. This case highlights the importance of adopting a systematic approach in managing uncommon presentations.