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Vasitis nodosa: immunohistochemical findings--case report
M Sakaki1, M Hirokawa, H Horiguchi
1Department of Pathology, University of Tokushima School of Medicine, Japan. smika@basic.med.tokushima-u.ac.jp
Summary
Vasitis nodosa, a rare condition, presents as ductal proliferation in the vas deferens post-vasectomy. Immunohistochemistry aids in differentiating it from other tumors using specific cytokeratin and vimentin markers.
Area of Science:
- Uropathology
- Surgical Pathology
- Immunohistochemistry
Background:
- Vasitis nodosa is a rare benign condition affecting the vas deferens.
- It typically presents as nodular indurations at the site of prior vasectomy.
- Understanding its distinct pathological features is crucial for accurate diagnosis.
Observation:
- Microscopic examination revealed proliferation of small ducts within the vas deferens wall and surrounding connective tissue.
- Immunohistochemical analysis showed positivity for cytokeratins 7, 19, 34betaE12, and vimentin in the proliferating glandular cells.
- Markers like Epithelial membrane antigen and Leu-M1 highlighted the luminal surface, while CA125 showed focal positivity.
Findings:
- The immunohistochemical profile of vasitis nodosa was characterized by strong expression of cytokeratins 7, 19, 34betaE12, and vimentin.
- Negative staining for cytokeratin 20, carcinoembryonic antigen, and prostate-specific antigen was noted.
- These findings help distinguish vasitis nodosa from malignant neoplasms.
Implications:
- Accurate immunohistochemical evaluation is essential for differentiating vasitis nodosa from other conditions, including prostatic adenocarcinoma, adenocarcinoma of the rete testis, and adenomatoid tumor.
- This study provides a detailed immunohistochemical signature for vasitis nodosa.
- Correct diagnosis prevents misclassification and inappropriate treatment of this benign condition.