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Case Reports in Medicine
Volume 2010 (2010), Article ID 819242, 4 pages
Case Report

Pulmonary Alveolar Microlithiasis: A Case Report with Emphasis on Imaging Findings

1Department of Radiology, Rio de Janeiro Federal University, CEP 21941.913, Rio de Janeiro, Brazil
2Department of Radiology, Fluminense Federal University, CEP 24220.071, Rio de Janeiro, Brazil

Received 9 April 2010; Revised 3 June 2010; Accepted 16 June 2010

Academic Editor: Raed Dweik

Copyright © 2010 Guilherme Abdalla et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Pulmonary alveolar microlithiasis (PAM) is a rare disease characterized by the presence of small calculi in the alveolar space. The authors report a case of a 21-year-old man with a 2-year history of shortness of breath on exertion and dry cough. Physical examination was altered only for crackles at auscultation. Pulmonary function revealed a mild restrictive ventilatory defect and the chest radiograph demonstrated paracardiac confluence of dense micronodular infiltrate. High-resolution CT scan revealed diffuse ground glass attenuation and septal thickening, more pronounced in lower pulmonary regions, with calcifications along the interlobar septa and subpleural regions. A transbronchial lung biopsy confirmed the diagnosis of PAM.