Pulmonary alveolar microlithiasis (PAM) is a rare disease characterised by the presence of small calculi in the alveolar space. The authors report a case of a 59-year-old woman with a 2-year history of dry cough. Physical examination was nil significant except for fine crackles at auscultation. Pulmonary function revealed a mild restrictive ventilatory defect and the chest radiograph demonstrated bilateral dense micronodular infiltrates giving diffuse sandstorm appearance. High-resolution CT

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... n revealed diffuse ground glass attenuation and septal thickening, more pronounced in mid and lower pulmonary regions, with calcifications along the interlobar septa and subpleural regions. A transbronchial lung biopsy confirmed the diagnosis of PAM.