[Alveolar lipoproteinosis].

The diagnosis of alveolar lipoproteinosis was established in a 46-year-old man's lung biopsy. The tissue was processed both for paraffin sections and electron microscopy. Morphology corresponded to the data in literature. Nevertheless, detailed clinical search and morphology failed to reveal causal factors. The case belonged to the group of alveolar proteinosis with uncertain etiopathogenesis.