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  • • Localized collection of pus

    • Acute: < 6 wks

    • Chronic: > 6 wks


  • • Aspiration of oropharyngeal contents

    • Acute necrotizing pneumonia (Staph, Klebsiella)

    • Chronic pneumonia due to fungi, TB

    • Opportunistic infection in immunocompromised person


  • • Bronchial obstruction (cancer, foreign body)

    • Cavitating pulmonary lesions (cancer)

    • Direct extension (amebiasis, subphrenic abscess)

    • Hematogenous dissemination


  • • Increased incidence with AIDS, transplantation, and chemotherapy

    • Pathogens typically found in cultures include:

    • -Staphylococcus



      -E coli




    • Pathogens found in immunocompromised patients:

    • -Candida


      - Pneumocystis carinii

Symptoms and Signs

  • • Cough, fever, dyspnea, pleuritic chest pain

    • Malaise, weight loss if chronic

    • On exam: Clubbing; signs of pleural effusion; cachexia; and rarely, draining chest wound (empyema necessitatis)

Laboratory Findings

  • • Elevated WBC, with left shift

    • Positive sputum culture

Imaging Findings

  • Chest film: Area of intense consolidation or rounded density; with or without air-fluid level

    CT scan: Helpful in cases of suspected bronchial obstruction

  • • Evaluate for primary structural diseases of lungs, including cancer

  • • WBC, sputum culture

    • Chest x-ray and chest CT scan

    • Bronchoscopy in patients with unexplained reason for lung abscess

    • Fine-needle aspiration (FNA) of abscess cavity identifies pathogens in 94% of cases

    • -Bronchoalveolar lavage (BAL) identifies organism in only 3%

    • FNA important to identify unusual organisms in immunocompromised patients

  • • Antibiotics mainstay of treatment

    • Penicillin and clindamycin commonly used

    • Trimethoprim-sulfamethoxazole, pentamidine, erythromycin, or amphotericin B often indicated in immunocompromised patients

    • Continue antibiotics until complete resolution (3-6 mos)

    • Chest physiotherapy, bronchoscopy with drainage may be necessary



  • • Poor response to above medical regimen, percutaneous drainage

    • Tense abscess (mediastinal shift, shift of diaphragm, etc)

    • Evidence of contralateral lung contamination

    • Signs of sepsis after 72 hrs of antibiotic therapy

    • Abscess size > 4 cm or enlarging

    • Rising fluid level

    • Persistent ventilatory dependency


  • • Rupture into bronchus

    • Rupture into pleural space resulting in pyopneumothorax

    • Massive hemoptysis


  • Percutaneous drainage: 1.5% mortality, 10% morbidity

    Overall mortality rate: 5-20%

    Medical therapy success: 75-88%

    Operative patients: Cured 90% of time, 1% mortality

    Mortality in immunocompromised patients: 28%


Schiza S. Siafakas NM. Clinical presentation and management of empyema, lung abscess and pleural effusion. Current Opinion in Pulmonary Medicine. 2006, 12(3):205-11.  [PubMed: 16582676]
Puligandla PS. Laberge JM. Respiratory infections: pneumonia, lung ...

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