LAM is a rare disease that predominantly affects women of child-bearing age. To study in more detail this rare disease, this multi-center project will establish a registry of persons with LAM. By combining data from 6 centers and outside physicians, this study may yield valuable information regarding the rate of decline in pulmonary function and quality of life in individuals with LAM. These patients will be followed over a five-year period. Tissue collected from study participants may facilitate future studies into the molecular basis of LAM.