Pneumonia Pathology

Question 1

Stages of lobar pneumonia

Answer 1

Congestion
Red hepatization
Gray hepatization
Resolution

Question 2

Microscopic features of congestion stage of lobar pneumonia

Answer 2

Vascular engorgement
Intra-alveolar fluid with few neutrophils
Numerous bacteria

Question 3

Microscopic features of red hepatization stage of lobar pneumonia

Answer 3

Neutrophils, RBCs, and fibrin filling the alveolar spaces

Question 4

Microscopic features of gray hepatization stage of lobar pneumonia

Answer 4

Disintegration of RBCs
Persistence of fibrinosuppurative exudate

Question 5

Extension of infection from the lungs through the pleural surface into the pleural cavity

Answer 5

Empyema

Question 6

General complications of pneumonia

Answer 6

Lung abscess
Empyema
Bacteremia and dissemination

Question 7

Common anaerobic causes of lung abscess

Answer 7

Bacteroides
Fusobacterium
Peptococcus

Question 8

Common aerobic causes of lung abscess

Answer 8

Streptococci
S aureas
Gram negative

Question 9

Complications of lung abscess

Answer 9

Empyema
Hemorrhage
Development of brain abscess or meningitis from septic emboli
Secondary amyloidosis