Pulmonary uptake of 99mTc diphosphonate in alveolar microlithiasis.

Rosenthal et al. [1] recently reported a series of patients with pulmonary uptake of bone imaging tracer. All patients in that series had evidence of renal failure, and the majority had hypercalcemia as factors relating to their metastatic pulmonary calcification . We recently studied a patient with pulmonary alveolar microlithiasis without abnormal laboratory values who also demonstrated diffuse intense uptake of bone tracer in the lung.