Related Experiment Video
Updated: Aug 14, 2025
Isolation of Brain-infiltrating Leukocytes
Published on: June 13, 2011
Klebsiella Pneumoniae Brain Abscess in a Patient With Chronic Lymphocytic Leukemia
Anisha Rajavel1, Waleed Sadiq1, Madeeha Subhan Waleed2
1Internal Medicine, Staten Island University Hospital, Staten Island, USA.
Abstract:
Klebsiella Pneumoniae (K. pneumoniae) is a common nosocomial pathogen. However, Klebsiella-associated meningitis and brain abscess formation are extremely rare in the United States. We present a case of a 73-year-old male who initially presented for a tonsillar abscess of unknown etiology. While awaiting an abscess biopsy, the patient underwent molar extraction for chronic periodontitis and decay. The patient subsequently developed K. pneumoniae bacteremia and meningitis. As he clinically declined, repeat imaging revealed a brain abscess with eventual hemorrhagic transformation. Notably, the patient had underlying hypogammaglobulinemia from chronic lymphocytic leukemia (CLL), which we believe contributed to the invasive disease. Given the global spread of virulent strains of Klebsiella (such as hypervirulent or hypermucoviscous K. pneumoniae), clinicians must bear this pathogen in mind while treating critically ill and immunocompromised patients.
Insights
Klebsiella pneumoniae, a common hospital pathogen, rarely causes meningitis and brain abscesses in the US. This case highlights the risk in immunocompromised patients, particularly those with chronic lymphocytic leukemia.
Area of Science:
- Infectious Diseases
- Neurology
- Oncology
Background:
- Klebsiella pneumoniae (K. pneumoniae) is a significant nosocomial pathogen.
- K. pneumoniae-associated meningitis and brain abscesses are exceptionally rare in the United States.
- The rise of hypervirulent Klebsiella strains necessitates awareness.
Observation:
- A 73-year-old male with chronic lymphocytic leukemia (CLL) and hypogammaglobulinemia presented with a tonsillar abscess.
- Following dental extraction, the patient developed K. pneumoniae bacteremia, meningitis, and a brain abscess with hemorrhagic transformation.
- The patient's underlying immunodeficiency likely predisposed him to invasive Klebsiella infection.
Findings:
- K. pneumoniae can cause severe invasive central nervous system disease, including meningitis and brain abscess.
- Hypogammaglobulinemia, associated with CLL, may increase susceptibility to invasive Klebsiella infections.
- Successful management requires prompt recognition and treatment of both the infection and the underlying immune defect.
Implications:
- Clinicians should consider K. pneumoniae in critically ill and immunocompromised patients presenting with neurological symptoms.
- Increased vigilance is crucial due to the global emergence of hypervirulent K. pneumoniae strains.
- This case underscores the importance of considering opportunistic infections in patients with hematologic malignancies and impaired immunity.
