Chylothorax as a complication of Waldenström's disease.

We describe a case of chylothorax associated with Waldenström's disease, interpreted as a rare complication of this disease. The chylothorax is probably caused by lympho-reticular infiltration of the thoracic duct. In non-traumatic chylothorax, occurring in an adult, Waldenström's disease should be considered as a possible primary cause.