Alveolar v interstitial lung disease

Question 1

airspace disease

Answer 1

1) soft tissue opacities
2) hazy and indistinct margins-fluffy. tend to be homogenous
3) tend to respect segmental or lobar boundaries
4) may contain air bronchograms

Question 2

air bronchogram

Answer 2

visible when something fluid fills alveoli. DD- pulmonary edema fluid, blood, gastric aspirate, inflm exudate

Question 3

interstitial (infiltrative lung disease)

Answer 3

discrete particles of disease. inhomogeneous. doesn’t respect lobar boundaries. usually no air bronchograms. made of lines (reticular) or dots (nodular) or both (reticulonodular)

Question 4

common interstitial lung disease

Answer 4

cancer, sarcoidosis, cystic fibrosis, asbestosis. nodular: hematogenously disseminated (ca), silicosis, miliary TB
reticular- idiopathic pulmonary fibrosis, eosinophilic granuloma, pulmonary intersitial edema, rheumatoid lung

Question 5

CF

Answer 5

thickened bronchial wall.

Question 6

honeycomb pattern

Answer 6

interstitial lung disease with coarse, criss crossing pattern. in eosinophilic granuloma and bronchiectasis

Question 7

grand-glass opacification

Answer 7

seen on CT of infiltrative disease. non-specific. differentiated from airspace disease by lack of bronchograms and visible blood vessels