Endometriosis is dened as the presence of functional extra-uterine endometrial tissue, which can suffer hemorrhage, inammation, brosis and adhesion formation, causing pelvic pain and infertility. The chest is a place where the presentation of endometriosis is rare, its diagnosis is based on the clinical picture of pneumothorax without associated trauma but with cyclical presentation. The pathological study is based on the presence of stroma and endometrial glands. The management of thoracic endometriosis is medical based on hormonal treatment, and surgical management for the management of complications or resection of the ovaries and hysterectomy to avoid recurrence. We present a case of a patient with recurrent catamenial pneumothorax.