[Alveolar microlithiasis]

A total of three observations on alveolar microlithiasis are described: two in female patients aged 19 and 44, and one in a man aged 56 years. In two patients diagnosis was established following biopsy of the lung tissue, and in one--posthumously. Basing on the literature data, the authors discuss problems of pathogenesis, clinico-morphological manifestations and differential diagnosis of the disease.