Pulmonary alveolar microlithiasis (PAM) is a rare disease. It is progressive characterized with deposition of calcified granules in the alveolar space. Though etiology is not known, 50% of cases diagnosed have familial history. Our case was a 22-years-old soldier. During screening program, lesions on his chest roentgenogram were detected, he was admitted. His high resolution computerized tomography was compatible with PAM. Histologic diagnosis of the disease was provided by bronchoscopic biopsy. The bone scintigraphy supported the diagnosis. The patient’s brother was also diagnosed PAM..