The information on this website is not intended for diagnosis or treatment. Please consult your physician for health concerns.

+90 850 321 50 00

Lung Abscess

Necrotic cavity within lung parenchyma containing pus, surrounded by inflammation, typically due to aspiration of oropharyngeal flora; primary lung abscess (no underlying cause), secondary (post-obstruction by tumor, foreign body, bronchiectasis); modern management with prolonged antibiotics 4-8 weeks, drainage indicated for > 6 cm cavities or persistent infection.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Göğüs Hastalıkları department. Book Appointment →

What is Lung Abscess?

Lung abscess is a localized purulent infection of the lung parenchyma producing necrosis with cavitation, typically > 2 cm in diameter (smaller foci are termed 'necrotizing pneumonia' or microabscesses if multiple). The annual incidence in the antibiotic era has decreased to 1-2 per 100,000, but mortality remains 10-20 percent due to underlying comorbidities and frequent secondary lung disease.

Etiology and classification: 1) Primary lung abscess (60-80 percent) — aspiration of oropharyngeal contents (alcohol intoxication, anesthesia, drug abuse, seizure, stroke with impaired gag reflex, esophageal disease, dementia); typically polymicrobial with anaerobic predominance (Bacteroides, Fusobacterium, Peptostreptococcus, Prevotella) along with Streptococcus species (especially Streptococcus anginosus group, formerly Streptococcus milleri); affects right lung > left (right main bronchus more vertical), posterior segment of right upper lobe (when supine) or superior segment of right lower lobe (when erect); 2) Secondary lung abscess (20-40 percent) — post-obstructive (endobronchial tumor in smokers, retained foreign body, bronchial stenosis), bronchiectasis, immunocompromised hosts (HIV, transplant, chemotherapy), septic embolism (right-sided endocarditis with IV drug use, septic thrombophlebitis Lemierre syndrome from Fusobacterium necrophorum tonsillitis), hematogenous spread (skin, urinary tract infections), trauma; microbiology often includes Klebsiella pneumoniae (alcoholics, classic 'currant jelly' sputum), Staphylococcus aureus (post-influenza), Pseudomonas (cystic fibrosis), Nocardia (immunocompromised), fungi (Aspergillus in immunocompromised, neutropenic), Mycobacterium tuberculosis (cavitary TB, especially in HIV).

Pathophysiology: Aspiration of large numbers of bacteria from oral cavity (especially in poor dentition with periodontal disease — anaerobes 10^11/g of dental plaque, Fusobacterium and Peptostreptococcus), bronchial obstruction or impaired clearance leads to localized infection, neutrophil influx, suppuration, necrosis from bacterial enzymes and ischemia, cavity formation when necrotic material communicates with bronchus and is expelled (productive cough of foul-smelling sputum classically described). Time course: pneumonia phase 1-2 weeks (consolidation, fever, productive cough), then cavitation 1-2 weeks later as necrosis develops and air-fluid level appears on imaging; chronicity > 4-6 weeks defines chronic lung abscess (worse prognosis, often with bronchiectasis, hemoptysis).

Symptoms

Productive cough with foul-smelling, putrid sputum (classic for anaerobic infection)
Fever, chills, night sweats (subacute presentation)
Pleuritic chest pain (pleural involvement)
Hemoptysis (10-30 percent of cases, can be massive)
Weight loss, anorexia, fatigue (chronic course mimicking malignancy)
Productive cough of large volumes of purulent sputum following clinical improvement (cavity rupture into bronchus)
Foul breath (oral hygiene reflects underlying anaerobic infection source)
Dyspnea (extensive disease or empyema complication)
Clubbing of fingers (chronic abscess > 2 weeks)
Decreased breath sounds and dullness over abscess area; possible amphoric breath sounds

Risk Factors

Aspiration risk factors: alcoholism, drug abuse (intravenous and oral), seizure disorders, neurologic disease (stroke, Parkinson, dementia), esophageal disease (achalasia, Zenker diverticulum, GERD), general anesthesia, sedation
Poor dentition (periodontal disease, dental caries, abscesses — high anaerobic load)
Immunocompromised state (HIV/AIDS, organ transplant, chemotherapy, neutropenia, corticosteroids, biologics)
Endobronchial obstruction (lung cancer, bronchial carcinoid, foreign body aspiration in children)
Bronchiectasis (cystic fibrosis, post-tuberculosis)
Right-sided endocarditis with septic emboli (IV drug abuse)
Lemierre syndrome (Fusobacterium necrophorum from tonsillitis)
Diabetes mellitus, chronic kidney disease, malnutrition
Recent abdominal surgery (subdiaphragmatic abscess with pleural extension)
Penetrating chest trauma
Bronchopulmonary fistula

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Persistent productive cough with foul-smelling sputum > 1-2 weeks
  • Hemoptysis (any amount)
  • Persistent fever > 1 week despite outpatient antibiotic treatment
  • Severe weight loss with chronic cough (rule out tuberculosis, lung cancer)
  • Risk factors for aspiration with new respiratory symptoms (alcoholism, neurologic disease)
  • History of recent dental procedure with new chest symptoms
  • Worsening symptoms during pneumonia treatment (suspect cavity formation)
  • Suspected lung cancer with cavitary lesion on imaging
  • Immunocompromised patient with new respiratory symptoms

Treatment Methods

01
Diagnostic workup: detailed history (aspiration risk factors, dental health, immune status, occupation, travel), physical examination, vital signs, oxygen saturation; chest X-ray (PA and lateral) — cavitary lesion with air-fluid level (pathognomonic), localized infiltrate evolving to cavity, often in dependent segments (right > left lung); CT chest with IV contrast (gold standard) — characterizes abscess (thick-walled cavity with rim enhancement, air-fluid level, surrounding consolidation), identifies underlying cause (endobronchial tumor, foreign body, bronchiectasis), excludes empyema (lentiform pleural collection vs round abscess), guides percutaneous drainage planning; bronchoscopy indicated if suspected endobronchial obstruction (especially in smokers > 50 years), refractory abscess, suspected foreign body, hemoptysis investigation, sampling for microbiology
02
Microbiological diagnosis: sputum Gram stain and culture (often contaminated by oral flora — false positives), blood cultures (positive in 20-30 percent), bronchoalveolar lavage (BAL) via bronchoscopy or protected brush specimen (more reliable), CT-guided percutaneous aspiration if accessible, pleural fluid culture if empyema present; specific tests for AFB (acid-fast bacilli for TB), fungi (KOH stain, culture, beta-D-glucan, galactomannan for Aspergillus), Nocardia (modified acid-fast stain), anaerobic cultures (special transport media)
03
Empiric antibiotic therapy: cover anaerobes (key in primary lung abscess) — first-line options include 1) Beta-lactam + beta-lactamase inhibitor (ampicillin-sulbactam 3 g IV q6h, piperacillin-tazobactam 4.5 g IV q8h, amoxicillin-clavulanate PO 875/125 mg q12h); 2) Carbapenems (meropenem 1 g IV q8h, imipenem 500 mg IV q6h) for severe disease or hospital-acquired; 3) Clindamycin 600-900 mg IV q8h or 300-450 mg PO q6h (excellent anaerobic coverage but resistance increasing 10-30 percent for Bacteroides fragilis group, monitor C. difficile risk); 4) Combination metronidazole + penicillin or ceftriaxone (metronidazole monotherapy inadequate as misses microaerophilic Streptococcus species); avoid fluoroquinolones alone (poor anaerobic coverage); cover Staphylococcus aureus (vancomycin or linezolid for MRSA risk) if hospital-acquired or post-influenza presentation
04
Targeted antibiotic therapy: based on culture results — Klebsiella (third-generation cephalosporin or carbapenem if ESBL), Pseudomonas (piperacillin-tazobactam, cefepime, meropenem with aminoglycoside), MRSA (vancomycin, linezolid, ceftaroline), Aspergillus (voriconazole, isavuconazole), Nocardia (TMP-SMX); duration 4-8 weeks total (IV initially 1-2 weeks, then oral until radiographic resolution); treatment failure rate 10-15 percent
05
Postural drainage and chest physiotherapy: positioning to facilitate drainage (Trendelenburg with abscess uppermost), percussion and vibration, deep breathing and coughing exercises, incentive spirometry; reduces sputum burden and facilitates antibiotic penetration
06
Bronchoscopy indications: suspected endobronchial obstruction (mass, foreign body), refractory abscess (no improvement at 2-4 weeks), persistent or massive hemoptysis, sampling for microbiology; therapeutic bronchoscopy can remove obstruction (foreign body removal, tumor debulking), drain abscess via intra-cavitary placement of guide wire and pigtail catheter (rare modern technique)
07
Percutaneous drainage indications: cavity > 6 cm, peripheral location accessible to needle, failure of antibiotics 2-4 weeks, life-threatening sepsis or hemoptysis; CT-guided pigtail catheter drainage (8-14 F) under local anesthesia, drainage continued until output minimal and clinical/radiographic improvement (typically 1-2 weeks); risks include pneumothorax (needs chest tube in some cases), bleeding, bronchopleural fistula
08
Surgical resection (rare in modern era): indications include massive hemoptysis (unresolved by bronchial artery embolization), bronchopleural fistula with empyema, suspected lung cancer (excisional biopsy and treatment), failed antibiotic and drainage in immunocompromised, multiple cavitary disease (pneumonectomy or lobectomy); video-assisted thoracoscopic surgery (VATS) for selected cases, traditional thoracotomy for complex disease
09
Treatment of underlying cause: address aspiration risk (treat alcoholism, control seizures, dysphagia rehabilitation, swallowing assessment, NG tube or PEG if severe), oral hygiene improvement (dental cleaning, periodontal treatment, dental abscess drainage), endobronchial tumor management (chemotherapy/radiation if non-resectable, resection if early stage), bronchiectasis (chest physiotherapy, mucolytics, treatment of exacerbations); endocarditis (prolonged antibiotics, valve surgery if indicated)
10
Complications and follow-up: empyema (5-10 percent — requires chest tube drainage), bronchopleural fistula (rare), massive hemoptysis (bronchial artery embolization or surgery), septic emboli to brain (brain abscess from septic emboli), recurrence (10-20 percent); follow-up CT chest at 4-8 weeks to assess cavity resolution; persistent cavity > 8-12 weeks suggests treatment failure or alternative diagnosis (lung cancer, mycobacterial infection, fungal infection); rehabilitation of underlying conditions to prevent recurrence; mortality 5-10 percent in primary abscess, 20-40 percent in secondary or immunocompromised hosts

Which Department to Visit?

You can visit our Göğüs Hastalıkları department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

Learn About Göğüs Hastalıkları Department

Let us help you

You can make an appointment with our specialists or contact us for your concerns.

Book AppointmentContact Us

Related Health Topics

Other articles from the same department you may want to explore.

Asthma

Göğüs Hastalıkları

Asthma is characterized by wheezing, coughing and shortness of breath attacks; with proper treatment it can be kept under control.

COPD (Chronic Obstructive Pulmonary Disease)

Göğüs Hastalıkları

COPD is an irreversible lung disease characterized by shortness of breath and chronic cough; quitting smoking slows its progression.

Pneumonia

Göğüs Hastalıkları

Pneumonia presents with high fever, cough and shortness of breath; the vast majority recover with appropriate antibiotic treatment.

Tuberculosis (TB)

Göğüs Hastalıkları

Tuberculosis presents with weeks-to-months of cough, fever, and night sweats; early diagnosis and treatment lead to full recovery.

Pleural Effusion

Göğüs Hastalıkları

Pleural effusion is the accumulation of excess fluid in the pleural space, resulting from imbalances in fluid production and removal, and represents a manifestation of diverse cardiopulmonary, infectious, and malignant disorders.

Pneumothorax

Göğüs Hastalıkları

Pneumothorax is the presence of air in the pleural space resulting in partial or complete lung collapse, classified as spontaneous (primary/secondary), traumatic, or iatrogenic, with tension pneumothorax representing a life-threatening emergency.

Bronchitis (Acute and Chronic)

Göğüs Hastalıkları

Acute bronchitis is mostly viral and resolves spontaneously, while chronic bronchitis is a smoking-related component of COPD.

Bronchiectasis

Göğüs Hastalıkları

Bronchiectasis is a chronic respiratory disease characterized by permanent, abnormal dilation of bronchi with associated destruction of muscular and elastic components of airway walls, resulting in impaired mucociliary clearance and recurrent infection.

Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.