16-Pulmonary nodules

1-Definition:

Is a rounded or oval pulmonary shadow with well defined edge and has a size less than 3 cms in diameter as seen in the following image.

Causes:

-Bronchogenic carcinoma.

-Metastases.

-Tuberculoma.

-Hamartoma.

-Arteriovenous malformation.

-Hydatid cyst.

-Sarcoid.

-Lymphangitic carcinomatosis.