SNO

No of patients

Intraoperative findings

1

36

Ipislateral crowded ribs

2

36

Thickened parietal and visceral pleura (0.2 - 0.5 cm thick)

3

7

Seropurulent materials or substances (range, 200 - 1000 mls)

4

3

Serosanguinopus fluid (range, 300 - 700 mls)

5

4

Fribrinoid exudates (range, 500 - 800 mls)

6

36

Partial or total ipislateral lung collapse

7

20

Frank thick pus (range, (500 - 3000 mls)

8

6

Empyema necesssitans

9

2

Destroyed lobe(s)