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Lymph node reticulum cell neoplasm with progression into cytokeratin-positive interstitial reticulum cell (CIRC)
1Pathology Section, Department of Human Pathology, I.R.C.C.S. Policlinico S. Matteo, University of Pavia, Italy.
Histopathology
|November 26, 2003
Summary
A rare fibroblastic reticulum cell (FBRC) tumor transformed into an aggressive sarcoma. This case highlights potential dedifferentiation and the role of p53 in reticulum cell tumorigenesis.
Area of Science:
- Oncology
- Pathology
- Immunohistochemistry
Background:
- Primary lymph nodal fibroblastic reticulum cell (FBRC) tumors are rare neoplasms.
- Understanding the progression of FBRC tumors is crucial for diagnosis and treatment.
Observation:
- A case of a 70-year-old female with a submandibular lymph node FBRC tumor is presented.
- Sequential biopsies revealed morphological and immunohistochemical changes upon relapse.
- The relapsed tumor exhibited cytokeratin positivity and intense p53 expression.
Findings:
- Initial diagnosis of FBRC tumor based on morphology and immunohistochemistry (vimentin, CD68, factor XIIIa, alpha1-antitrypsin, fascin, actin).
- Tumor progression to a cytokeratin-positive interstitial reticulum cell (CIRC) sarcoma with aggressive clinical course and fatal outcome.
- Negative Epstein-Barr virus in-situ hybridization.
Implications:
- Morphological and p53 changes suggest tumor cell dedifferentiation, correlating with aggressive behavior.
- Intense p53 expression may indicate a role in reticulum cell tumorigenesis.
- This case underscores the importance of sequential biopsies in characterizing rare tumor progressions.