High Resolution CT > Findings > Tree-In-Bed


"Tree-in-bud" appearance represents dilated and fluid-filled (i.e. pus, mucus, or inflammatory exudate) centrilobular bronchioles. Abnormal "tree-in-bud" bronchioles can be distinguished from normal centrilobular bronchioles by their more irregular appearance, lack of tapering or knobby/bulbous appearance at the tip of their branches. The "tree-in-bud" distribution is often patch throughout the lung.

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