Response to treatment with progesterone in a patient with pulmonary lymphangioleiomyomatosis.

Lymphangioleiomyomatosis (LAM) is defined as an abnormal proliferation of smooth muscles around lymphatics, venules, and brochioles. This article describes our experiences treating a 21-year-old, white female who experienced recurrent shortness of breath during air travel last year. Her episode was severe and the patient was transported to the hospital as soon as the airplane landed.