3. Lung Abscess:
Lung Abscess is a localized necrotic lesion of the lung
parenchyma containing purulent material that collapses and
forms a cavity. It is generally caused by aspiration of anaerobic
bacteria.
In many cases the causes and pathogenesis of lung
abscess are similar to those of pneumonia. Most lung abscess
are caused by aspiration of material from the GI tract into the
lungs

4. The areas of the lungs most commonly
affected are :
• The superior segment of the lower lobes.
• The posterior segment of the upper
lobes.

5. Conditions contributing to lung abscess:
1) Aspiration of oropharyngeal or gastric secretion.
2) Septic emboli.
3) Necrotizing pneumonia
4) Vasculities: wegeners granulomatosis
5) Necrotizing tumors
6) Gram negative organisms. (klebsiella)

6. 7) Anaerobic bacilli (Bacterorides)
8) Carcinoma of the lung
9) TB
10) Parasitic and fungal diseases of the lung.

7. Clinical manifestations:
1) Cough with foul smelling purulent sputum.
2) Fever with shivering
3) Night sweats
4) Bemoptysis
5) Chest pain
6) Shortness of breath

8. 7) Lethargy
8) Finger clubbing
9) Fever
10) Leukocytosis
11) Dyspnea
12) Weakness
13) Anorexia
14) Weight loss