Perilymphatic Pulmonary Nodules: Definition, Differential Diagnosis, and Demonstration of the “Pipe-Cleaner” Sign

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Abstract

Pulmonary nodules may be categorized as perilymphatic, random, or centrilobular based on their CT distribution. A perilymphatic pattern describes nodules in the expected distribution of pulmonary lymphatics, such as along pleural surfaces, interlobular septa, and the peribronchovascular interstitium. This review not only illustrates the CT appearance but also provides a differential diagnosis of perilymphatic pulmonary nodules.

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