Fig. 3From: Pulmonary alveolar proteinosis in a catCytology of the bronchoalveolar lavage fluid. a Increased number of neutrophil granulocytes and macrophages. In addition to the increased cellular components there are several crystals and cell debris. Hemacolor stain. b The alveolar macrophages have a foamy aspect and are filled with PAS-positive materialBack to article page