CT-High Resolution, CT, Lung, Anatomy, Decision analysis, Education and training
E.-J. Kang1, K.-N. Lee1, T.-H. Ham2; 1Busan/KR, 2Busan /KR
Mosaic attenuation pattern may represent small airway disease,
pulmonary vascular disease and parenchymal disease.
- Analysis the number and the size of pulmonary vessels in the area of low attenuation area helps the diagnosis to small airway disease or pulmonary vascular disease.
- In small airway disease,
air trapping in expiratory CT,
large airway dilatation of wall thickening in the low attenuation area,
and small centrilobular nodules are important findings.
- In pulmonary vascular disease,
dilated pulmonary artery and dilated right heart are clues and additional findings such as peripheral scarring will help the diagnosis.
- Mixed increased and decreased attenuation are difficult to diagnosis image alone and need other clinical history to make clear diagnosis.
This approach will help to make interpretation of mosaic attenuation (Table 1,
Table 1: Important discriminatory features.
Fig. 20: Flow chart for diagnosis of mosaic attenuation.