Mosaic pattern
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This document discusses the mosaic pattern seen on CT scans of the chest. It describes how the pattern shows areas of increased and decreased density that correspond to areas of ground glassing and air trapping, respectively. The black areas represent air trapping and can be seen in conditions like bronchiolitis obliterans, sarcoidosis, and asthma. The white areas represent ground glassing and alveolitis/pneumonitis, seen in diseases like desquamative interstitial pneumonia and nonspecific interstitial pneumonia. The mosaic pattern results from airway disease causing air trapping or alveolitis/pneumonitis causing ground glassing.
Mosaic pattern
- 2. Mosaic Patternitie By Gamal Rabie Agmy , MD , FCCP Professor of Chest Diseases ,Assiut University
- 4. Where is the pathology ??????? in the areas with increased density meaning there is ground glass in the areas with decreased density meaning there is air trapping
- 5. Pathology in black areas Airtrapping: Airway Disease Bronchiolitis obliterans (constrictive bronchiolitis) idiopathic, connective tissue diseases, drug reaction, after transplantation, after infection Hypersensitivity pneumonitis granulomatous inflammation of bronchiolar wall Sarcoidosis granulomatous inflammation of bronchiolar wall Asthma / Bronchiectasis / Airway diseases
- 6. Airway Disease what you see…… In inspiration sharply demarcated areas of seemingly increased density (normal) and decreased density demarcation by interlobular septa In expiration ‘black’ areas remain in volume and density ‘white’ areas decrease in volume and increase in density INCREASE IN CONTRAST DIFFERENCES AIRTRAPPING
- 9. Chronic EAA
- 10. Hypersensitivity pneumonitis Extr. Allerg. Alveolitis (EAA) HRCT Morphology chronic: fibrosis Intra- / interlobular septal thickening Irregular interfaces Traction bronchiectasis acute - subacute acinar (centrilobular) unsharp densities ground glass (patchy - diffuse)
- 13. Pathology in white Areas Alveolitis / Pneumonitis Ground glass desquamative intertitial pneumoinia (DIP) nonspecific interstitial pneumonia (NSIP) organizing pneumonia In expiration both areas (white and black) decrease in volume and increase in density DECREASE IN CONTRAST DIFFERENCES
- 14. DI P
- 15. Cellular NSIP
- 16. Mosaic Perfusion Chronic pulmonary embolism LOOK FOR Pulmonary hypertension idiopathic, cardiac disease, pulmonary disease
- 17. CTEPH = Chronic thrombembolic pulmonary hypertension