pneumonia radiology

S aureus
organism lobar distribution
Klebsiella
organism bulging fissure
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viral and pneumocystis
organism interstitial penumonia
S aureus
organism pneumatocele
varicella, TB
organism alveolar nodules
healthy: viral (influenza)
imm-compro: pneumocystis > TB > candida
extensive BL pneumonia
lobar pneumonia
alveolar pneumonia
contiguous alveoli; children >>> adults
S pneumo, H influ, or Klebsiella, atypical measles
round pneumonia
lobar pneumonia
least amount of volume loss
round pneumonia
looks for fever and high WBC
confused with mass
if obscure the heart = right middle lobe
if don’t obscure = right lower lobe
lobe differentiation
TB until proven differently
enlarged LN with pneumonia
bronchopneumonia
combination of interstitial and airspace disease
lobular pneumonia
bronchopneumonia
small acing nodules which enlarge
bronchopneumonia
volume loss secondary to airway obstruction
pneumocystis
air density spherical lesions BL, will get bigger and risk of pneumothorax
ground glass opacities
pneumocytsis
risk of pneumothorax
gram (-): Klebsiella, pseudomonas
most nosocomial pneumonias
complication of pneumonia, have to wait until it seals and this takes awhile
bronchopleural fistula
pleural effusion is normal in pneumonia
empyema is when effusion is infected, surgery is required for this
pleural effusion vs empyema
common in (-) pneumonias
lead to arterial thrombosis and infarct
cavitation
infectious but not bacterial
inflammation in interstitium, rather than airspaces like other pneumonia types

viral or mycoplasma

infectious interstitial pneumonias
infectious interstital pneumonia
lead to type 2 alveolar damage and loss of surfactant
mucus plugs
usually viral (reticulated giraffe look)
infection of peribronchial tissue
viral pneumonia
hyaline membranes
viral pneumonia
most common cause of pneumonia < 5yo
influenza (uncommon unless cavitary)
viral pneumonia with cavitation
has two forms: rapidly progressive and fatal or limited with mild interstitial edema
hantavirus
peribronchial cuffing (wall thickening) = no crisp definition of vessels
viral pneumonia
dirty chest
wait 4-6 weeks (viral) because resolution can lag 2-3 weeks behind clinical resolution
follow up CXR
anaerobic (aspiration)
BL lower lobe
noninfectious eosinophilic pneumonia (CEP = chronic EP)
reverse bat wing pattern
empyema/lung abscess
pneumatocele
pneumothorax
pyopneumothorax
bronchopleural fistula
complications of pneumonia
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