Tension Hydrothorax from Disseminated Endometriosis

We present the case of a 34-year-old woman presenting to the emergency department (ED) with dyspnea, cough, and fever. She was found to have a tension hydrothorax and was treated with ultrasound-guided thoracentesis in the ED. Subsequent inpatient evaluation showed the patient had disseminated endometriosis. Tension hydrothorax has not been previously described in the literature as a complication of this disease.