Pulmonary alveolar microlithiasis

Case contributed by Dr Naim Qaqish


Known to have pulmonary microlithiasis.

Patient Data

Age: 25 years
Gender: Female


There is evidence of scattered fine high-density nodules over both lungs more evident at the lower lobes suggestive of microlithiasis.

No consolidation or mass lesion.

Heart size is normal.

Clear both CP angles.


9 months later

Compared to the previous study, stable appearance of the symmetrical fine high densities are seen in both lung fields.


3 months later

Compared to the previous x-ray, the previously mentioned changes compatible with the diagnosis of pulmonary microlithiasis are still seen with no significant changes.



Hila and mediastinum appear normal without evidence of mass lesions or gross lymphadenopathy.

Numerous tiny dense nodules are seen scattered in both lungs more evident at lower lobes consistent with pulmonary alveolar microlithiasis.

There is no evidence of lung masses or gross consolidations.

No evidence of pleural effusion.

Unremarkable chest wall and rib cage.

Case Discussion

This case illustrates the typical appearances of pulmonary alveolar microlithiasis "PAM".

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Case information

rID: 85377
Published: 28th Dec 2020
Last edited: 24th Mar 2021
System: Chest
Inclusion in quiz mode: Included

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