Chest computed tomography of a patient with thoracic endometriosis

Computed tomogram (CT) of the chest showing opacities in the right lower lobe (arrow) in a young woman with chest pain during menstruation (panel A). The opacities have completely resolved two weeks later after menstruation (panel B), illustrating the importance of obtaining imaging when patients with suspected thoracic endometriosis are symptomatic peri-menstruation.