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Hrct in diagnosis of diffuse lung diseases
1. HRCT in diagnosis of
diffuse Lung Diseases
Dr/Ahmed Bahnassy
Assistant Professor of Radiology
Qassim University
2. Technique and anatomy
Very thin 1mm slices for chest with 10-20
mm intervals aiming at visualizing the lung
interstitium.
3. Road map to diagnosis
1. Recognize the abnormality pattern.
2. Locate it in relation to the lung and to the
SPL
3. Evaluate its effects on lung parenchyma
45. Mosaic appearance
causes :
Airway Disease:
– Large air way (CF
,Bronchiectasis)
– Small air way (BOOP
,small air way
infection ,mucous
plugging)
Vascular diseases :
– Chronic PE
– vasculitis
55. Golden rules for HRCT
interpretation.
Honeycombing with a basal and subpleural redominance
is highly suggestive of UIP.Lung biopsy is rarely
performed when HRCT shows these findings.
Concentric lower lobe GG opaity without honeycombing
suggests NSIP.In a patient with collagen vascular
disease ,biopsy is uncommoly performed.
Patchy or noular subpleural or peribronchial
consolidation is typical of COP.
Cystic air spaces or GG opacity may represent LIP.LIP is
usually associated with other diseases.
Diffuse or centrilobular GG opacity in a smoker is typical
of DIP or RB-ILD
56. References
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lungs: high-resolution CT. Radiology 1988; 166: 81-87.
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sarcoidosis: evaluation with high-resolution CT. Radiology 1989; 172: 467-471.
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Pathologic-CT correlation. Radiology 1986; 160: 585-588.
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