Related Experiment Video
Updated: Jan 23, 2026
Use of the Invertebrate Galleria mellonella as an Infection Model to Study the Mycobacterium tuberculosis Complex
Published on: June 30, 2019
Necrotizing pneumonia in a patient with untreated Mycobacterium kansasii infection
Amit Toor1, Gerson De Freitas1, Jorge Torras1
1Internal Medicine Resident, Internal Medicine Department, Easton Hospital, Easton, PA, 18042, USA.
Abstract:
Mycobacterium kansasii is the second most commonly occurring Non-Tuberculous Mycobacteria (NTM) in the United States. Infection is typically seen in middle aged males, and the risk of infection is greatly increased in immunocompromised hosts. Pulmonary infection presents in clinical parallel to that of Mycobaterium tuberculosis (TB) and is therefore often misdiagnosed. A combination of clinical, radiological, and microbiological evidence of infection is generally required to clinch the diagnosis. Treatment of such cases include prolonged courses of rifampin in combination with 2 other antimicrobial agents. The overall prognosis with appropriate treatment is good with the exception of disseminated disease in severely immunocompromised hosts. In patients who are misdiagnosed or undertreated, there is progressive destruction of the lung parenchyma with distortion of lung architecture. This can in-turn lead to bronchiectatic changes leaving the airways exposed to devastating superimposed bacterial pneumonia. We describe a case of a patient with untreated M. kansasii infection who developed superimposed necrotizing pneumonia and respiratory failure requiring prolonged ventilatory support.
Insights
Mycobacterium kansasii infections, often misdiagnosed as TB, can lead to severe lung destruction. Prompt diagnosis and treatment are crucial for preventing complications like necrotizing pneumonia and respiratory failure.
Area of Science:
- Pulmonology
- Infectious Diseases
- Microbiology
Background:
- Non-tuberculous mycobacteria (NTM) infections, particularly Mycobacterium kansasii, are increasingly recognized.
- Mycobacterium kansasii pulmonary infections mimic tuberculosis (TB), leading to potential misdiagnosis.
- Immunocompromised individuals face a significantly higher risk of M. kansasii infection.
Observation:
- A case of untreated Mycobacterium kansasii infection is presented.
- The patient developed progressive lung destruction and bronchiectasis.
- Superimposed necrotizing pneumonia and respiratory failure ensued, necessitating prolonged mechanical ventilation.
Findings:
- Misdiagnosis or delayed treatment of M. kansasii can result in irreversible lung damage.
- Untreated M. kansasii can lead to severe complications, including secondary bacterial infections.
- This case highlights the critical need for accurate and timely diagnosis of NTM infections.
Implications:
- Early and accurate diagnosis of Mycobacterium kansasii is vital for effective treatment and improved patient outcomes.
- Understanding the clinical parallels with TB is essential for appropriate management strategies.
- This case underscores the importance of considering NTM in the differential diagnosis of pulmonary infections, especially in at-risk populations.
More Related Videos
12:21A Mouse Model for the Transition of Streptococcus pneumoniae from Colonizer to Pathogen upon Viral Co-Infection Recapitulates Age-Exacerbated Illness
Published on: September 28, 2022
13:27Osteopathic Manipulative Treatment as a Useful Adjunctive Tool for Pneumonia
Published on: May 6, 2014
Related Concept Videos
01:30Pneumonia I: Introduction
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
01:29Pneumonia II: Pathophysiology
01:28Pneumonia IV: Management
Bacterial Pneumonia Treatment
For bacterial pneumonia, antibiotics serve as the cornerstone of therapy. Initial treatment often begins with empirical antibiotics, tailored to the anticipated causative organism and adjusted based on culture results. Key antibiotic choices include:
01:30Pneumonia V: Nursing management and Prevention
The nurse must practice strict medical asepsis and adhere to infection control guidelines to minimize healthcare-associated infections.
Enhance airway patency
Position the patient correctly to facilitate drainage of the affected lung segments. Manual or mechanical percussion and vibration can also be employed....
01:30Pneumonia III: Complications and Assessment
01:20Infection
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...