Dot in box appearance
A "dot in box" appearance is a pattern that has been described with pulmonary lymphangitis carcinomatosis. The interlobular septal thickening from lympangitis forms polygonal arcades accounting for the box while the prominence of the centrilobular bronchovascular bundle is thought to represent the central dot in a polygon 1-2. This typically occurs in a non gravity dependent pattern and can be unilateral.
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