Clinical-histologic-microbiologic analysis of 419 lymph node biopsy specimens

Area of Science:

• Medical Microbiology
• Pathology
• Infectious Diseases

Background:

• Lymphadenopathy is a common clinical finding with diverse etiologies.
• Accurate diagnosis relies on correlating clinical presentation with laboratory findings.
• Microbial infections and inflammatory conditions are significant causes of lymphadenopathy.

Purpose of the Study:

• To correlate lymph node culture and histopathology findings with clinical diagnoses.
• To determine the utility of lymph node cultures in immunocompetent patients.
• To identify optimal conditions for microbial investigations in lymph node biopsies.

Main Methods:

• Retrospective analysis of 419 lymph node biopsy specimens from 414 patients (1978-1983).
• Correlation of culture results and histopathologic examination with clinical histories and diagnoses.
• Identification of microbial isolates and assessment of associated histopathologic features.

Main Results:

• Mycobacteria and fungi were the predominant clinically significant microbial isolates from lymph nodes.
• Bacterial, mycobacterial, or fungal diseases were associated with granulomatous and/or acute inflammatory lesions in 48/66 cases.
• Lymph node cultures in immunocompetent patients were positive only when granulomatous or acute inflammatory lesions were present.

Conclusions:

• Lymph node cultures in immunocompetent patients should be guided by the presence of granulomatous or acute inflammatory lesions.
• Cultures can be specifically targeted for mycobacteria and fungi in these cases.
• This approach optimizes diagnostic yield and resource utilization for lymphadenopathy investigations.