II. Pathophysiology

  1. Infiltrates within the air spaces (Bronchioles, alveoli)
  2. Pulmonary vessels are obscured (contrast with Interstitial Infiltrate)

III. Signs

  1. Segmental distribution of Pulmonary Infiltrate
  2. Coalescence of infiltrates
  3. Fluffy margins
  4. Air Bronchograms
  5. Rosette Patterns
  6. Silhouetting of normal structures

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