Signet Ring Sign
A bronchus appears abnormally larger than its accompanying pulmonary artery, indicating irreversible airway dilation.
Description
This scan is performed without contrast dye, focusing on obtaining ultra-thin slice thicknesses (usually 1-2 mm) of the lung tissue. Originating as a specialized application of standard CT in the 1980s, it provides highly detailed views of the interstitium. It is crucial for identifying specific patterns of fibrotic scarring.
Directly Diagnoses
Possible Results / States
Usual Interstitial Pneumonia (UIP) Pattern
A specific radiological pattern characterized by subpleural honeycombing, traction bronchiectasis, and reticular opacities.