Bilateral Symmetric vs Localized Disease

Figure 1. Bilateral Symmetric Disease

This image shows bilateral thickening of bronchovascular bundles, interlobular septa, and pleura. Some of the nodules in this case may be parenchymal.

Figure 2. Localized Disease

Septal lines are present focally in the right lung.

Note the presence of a right hilar mass, representing small cell carcinoma of the lung.

Figure 3. Lung Showing Patchy Disease

This image shows more of the lung shown with Unknown 10. Note that in this case, the interlobular and centrilobular thickenings do not extend to the pleura, suggesting patchy disease.

Note also that there are multiple tiny nodules in many lobules, indicating involvement of small bronchiolovascular bundles probably not visible on HRCT.

Note again the tumor in the hilar lymph nodes.

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