Fundamentals of Diffuse Lung Disease (2026)-R3-CCH0822-2026

Video Transcription

Video Summary

The transcript covers four chest CT pattern-recognition topics: consolidation/ground-glass opacity, mosaic attenuation, cystic lung disease, and micronodules.<br /><br />For consolidation and ground-glass opacity, the speaker emphasizes that these are broad, overlapping findings with large differentials, so radiologists should use precise terminology, identify any specific accompanying signs, and integrate clinical context. Helpful clues include chronicity, the reverse halo sign, halo sign, pleural abnormalities, nodules, and unusual densities. Ground glass should be distinguished from consolidation and from atelectasis.<br /><br />The mosaic attenuation talk explains that it reflects two main processes: mosaic perfusion, where lucent lung is abnormal, and ground-glass opacity. Mosaic perfusion is usually due to airways disease or chronic thromboembolic vascular disease. Features supporting mosaic perfusion include geographic borders, vessel size differences, and air trapping on expiratory CT. The main isolated cause discussed is constrictive bronchiolitis.<br /><br />The cystic lung disease section reviews non-diffuse mimics first, then key diffuse cystic diseases. Major entities include LAM, LIP, amyloidosis, light chain deposition disease, Birt-Hogg-Dubé syndrome, and Langerhans cell histiocytosis. Diagnostic clues include cyst shape, distribution, associated nodules, calcification, smoking history, renal tumors, Sjögren’s syndrome, and pneumothorax.<br /><br />The micronodule talk classifies nodules by secondary lobule distribution: centrilobular, perilymphatic, or random. This pattern strongly narrows the differential toward airway disease, sarcoidosis/lymphangitic spread, or hematogenous dissemination.

Keywords

consolidation

ground-glass opacity

mosaic attenuation

cystic lung disease

micronodules

constrictive bronchiolitis

LAM

Birt-Hogg-Dubé syndrome

sarcoidosis