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14 Cards in this Set
- Front
- Back
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what are the microscopic findings in the phase of gray hepatization in pneumonia?
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strong fibrinary alveolary exudate with only slight hyperemia
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phase of gray hepatization in pneumonia can be seen on which days?
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4th to 6th day
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phase of red hepatization in pneumonia can be seen on which days?
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2nd to 3rd day
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what are the 4 stages of lobar pneumonia?
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congestion
red hepatization gray hepatization resolution |
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what are the microscopic findings in the phase of congestion in pneumonia?
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vascular engorgement, intra-alveolar fluid with few neutrophiles and numerous bacteria
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what are the microscopic findings in the phase of red hepatization in pneumonia?
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massive confluent exudation with neutrophils, red cells and fibrin filling the alveolar spaces
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what are the microscopic findings in the phase of gray hepatization in pneumonia?
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progressive disintegration of red cells with persistence of fibrinosuppurative exudate
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what are the microscopic findings in the phase of resolution in pneumonia?
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transformation of exudates to fibromyxoid masses richly infiltrated by macrophages and fibroblasts
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what are 'atypical' pathogens of community-acquired pneumonia
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Mycoplasma pneumoniae
Legionella pneumophila Chlamydophyla pneumoniae viruses |
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what are viruses causing community-acquired pneumonia?
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Influenza A and B
Respiratory syncytial virus (RSV) Adenovirus Parainfluenza virus |
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what are the major mechanisms in the development of lung abscesses?
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aspiration of foreign material
postpneumonic abcess formation septic embolism postobstructive pneumonia in neoplasia |
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what is the major cause of lung abscesses?
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aspiration of foreign material
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what are the usual pathogens associated with postpneumonic abscess formation?
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S. aureus
K. pneumoniae Pneumococcus type 3 (most virulent pneumococcal serotype) |
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what are pathogens of chronic pneumonia?
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Nocardia and Actinomyces
M. tuberculosis and the dimorphic fungi (Histoplasmosis capsulatum, Blastomyces dermatitidis, Coccidioides immitis) produce granulomas |
