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Pulmonary alveolar microlithiasis is a relatively rare disease of unknown aetiology, characterized by the presence of multiple microscopic stones within the pulmonary alveoli. The striking radiological picture often contrasts with mild or even absent symptoms except late in the course of the disease.The radiological and clinical features of the disease have been well described (Sosman, Dodd, Jones, and Pillmore, 1957;Viswanathan, 1962;Yang and Lin, 1963). Detailed pulmonary function studies have received somewhat less attention.The purpose of this communication is to present respiratory function data in five cases of pulmonary alveolar microlithiasis, and to review some results of pulmonary function tests reported in the literature.

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