Intravascular, bronchiolar, and alveolar tumor of the lung (IVBAT). An analysis of twenty cases of a peculiar sclerosing endothelial tumor.

Twenty cases of an unusual tumor of the lung are described. This tumor usually presents with multiple small, slowly growing pulmonary nodules. Many cases are detected incidentally. Eighty percent are women, and 50% are less than 40 years of age. Survival with tumor can be quite long. However, one half the patients have died, usually of progressive pulmonary insufficiency. This is a peculiar sclerosing tumor of endothelial cell origin.