signet appearance due to dilated bronchus in near topulmonary artery.
In normal individuals, the adjacent pulmonary artery is the same size, or minimally smaller, than the bronchus. A bronchoarterial ratio >1.2 is indicative of abnormal bronchial dilatation. Substantial dilatation of the bronchus and smooth mural thickening results in a signet ring configuration
Reference:BiblioMed Textbook-Computed Body Tomography
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