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Morphometric analysis of AgNORs in the lymph node lesions
B Arora1, Rahul Jain, Sanjay Kumar
1Department of Pathology, P.G.I.M.S., Rohtak, India. drbarora@rediffmail.com
Quantitative analysis of silver-stained argyrophilic nucleolar organizer regions (AgNOR) in lymph nodes revealed significant differences. High-grade lymphomas showed higher AgNOR counts and areas compared to low-grade lymphomas and reactive lymph nodes.
Area of Science:
- Surgical Pathology
- Histopathology
- Oncology
Background:
- Silver-stained argyrophilic nucleolar organizer regions (AgNOR) are established biomarkers in surgical pathology.
- AgNORs are crucial for assessing cellular proliferation and have diagnostic and prognostic value.
- Quantitative and morphometric analysis of AgNORs can provide objective data for lesion characterization.
Purpose of the Study:
- To perform quantitative and morphometric analysis of AgNORs in various lymph node lesions.
- To compare AgNOR features in reactive lymphadenitis, low-grade non-Hodgkin's lymphoma (NHL), and high-grade NHL.
- To evaluate the utility of AgNOR morphometry in the differential diagnosis of lymph node pathologies.
Main Methods:
- Inclusion of ten cases each of reactive lymphadenitis and non-Hodgkin's lymphoma (NHL).
- NHL cases were further divided into five low-grade and five high-grade subtypes.
- Automated image analysis software (Biovis Image measure version 1.0) was used for quantitative and morphometric AgNOR analysis.
Main Results:
- Mean AgNOR count was highest in high-grade lymphoma (5.17 ± 0.255), followed by low-grade lymphoma (4.78 ± 0.41) and reactive lymph nodes (2.45 ± 0.486).
- Mean total AgNOR area was also highest in high-grade lymphoma (511.9 ± 41.52), then low-grade lymphoma (451.12 ± 37.1), and reactive lymphadenitis (215 ± 37).
- The mean ratio of single AgNOR dot area to nuclear area was lowest in high-grade lymphoma (0.0718 ± 0.01) compared to low-grade lymphoma (0.0826 ± 0.0096) and reactive lymph node (0.132 ± 0.01).
Conclusions:
- Morphometric evaluation of AgNOR features (count, total area, dot area, and ratios) demonstrates significant alterations across different lymph node lesions.
- These quantitative AgNOR parameters show potential as valuable tools for the differential diagnosis of challenging lymph node cases.
- AgNOR analysis offers objective insights into cellular changes, aiding in distinguishing reactive changes from malignant lymphomas.
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