Lobar pneumonia

1. Lobular Pneumonia
By - Disha Rajesh Bansod
Guided by - Aliya Abayevna
Group No. - GM21-10B

2. 2 . Lobar pneumonia
• 90-95% are caused by pneumococci.
• Others are klebsiella pneumonia ,
staphylococcus, strept., H. influenza.
• The consolidation involves a portion of a
lobe or the whole lobe.

3. Lobar pneumonia

4. Morphology of lobar pneumonia:
There are four stages of evolvement of lobar
pneumonia , they are:
1. Stage of congestion
2. Stage of red hepatization
3. Stage of grey hepatization
4. Stage of resolution.

5. Congestion stage
Grossly: the lung is heavy and red in color.
Mic.:
• Alveolar vascular congestion
• Intra-alveolar fluid with neutrophil +
bacteria .

6. Red hepatization
Grossly: red, firm, airless, look like a liver.
Mic.:
• The inflammatory exudate composed of
RBC+ neutrophil+ fibrin.

7. Red hepatization

8. Grey hepatization
Grossly: grey –brownish , dry surface.
Mic.:
• The exudate is composed of fibrin+ WBC
which is called (fibrino-suppurative)
exudate.

9. Early (organization) gray
hepatization

10. Gray hepatization

11. Resolution stage
The exudate undergo enzymatic
digestion formation of granular
debris, that is either resorbed &
ingested by the macrophages or
expectorated and coughed up.