It can be divided into two main categories:
1-Focal pulmonary lesions.
2-Diffuse pulmonary lesions.
The former can be subdivided into
-Nodules (A pulmonary lesion with well defined edge and diameter less than 3 cm).
-Masses.
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| Pulmonary lesion with a well defined and diameter more than 3 cm. |
-Patches.
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| Patch is a pulmonary lesion with ill defined borders and air bronchogram. |
While the latter (diffuse form) could be divided into
-Reticular pattern.
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| Composed mainly of reticular shadows scattered allover the chest |
-Ground glass pattern.
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| It is an opacity which do not obscure the pulmonary vessels inside it. |
-Nodular pattern (many small nodules less than 1 cm&uncountable).
-Cystic pattern (multiple cysts & uncountable).
PEARLS
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| Speculated ill defined wall pulmonary nodule. |
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| Hamartoma |
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| Water Lilly sign of rupture hydatid cyst. |
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| Ruptured hydatid cyst with intra cavitary mass. |
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| Fungal ball. |
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| Crazy paving appearance of alveolar protenosis. |
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| Crazy paving appearance of alveolar protenosis. |
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| Peribronchial cuffing (thickening). |
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| Septal lines. |
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| Honey combing |
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| Traction bronchiectasis |
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D.D. of reticular interstitial lung disease.
Or
not enlarged.
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D.D. of cystic diffuse lung disease.
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| Histiocytosis |
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| LAM |
D.D. of nodular diffuse lung disease.
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| Perilymphatic distribution |
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| Centrilobular distribution |
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| Random distribution |
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