CXR-
1) Ground glass opacification
2) Fine nodular or reticulonodular pattern (more prominent in sub acute phase)
[ Lower lung predominance ]
3) Chronic cases - fibrosis with upper lobe retraction, reticular opacity, volume loss and honeycombing may be seen
1) Poorly defined centrilobular nodules - < 5 mm in diameter , profuse throughout the lung ,but a mid to lower lung zone predominance noted (*ground glass attenuation)
- Usually regress with removal of exposure
2) Ground glass attenuation - most common in AHP
- may be patchy or diffuse
- middle lung zone predominance
- may resolve with removal of exposure
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