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Renal oncocytoma. Pathological evaluation and clinical implications
G Muzzonigro1, D Minardi, B Azizi
1Institute of Urology, University of Ancona, Italy.
Summary
Renal oncocytomas are benign kidney tumors. Immunohistochemistry and flow cytometry help determine their origin and chromosomal pattern, favoring kidney-sparing surgery for diploid tumors.
Area of Science:
- Nephrology
- Oncology
- Pathology
Background:
- Renal oncocytoma is a benign kidney tumor of tubular origin.
- Oncocytes, rich in mitochondria, may represent senescent cells.
- Surgical options like partial nephrectomy are often curative.
Purpose of the Study:
- To investigate the histogenetic origin of renal oncocytomas.
- To evaluate the utility of flow cytometry in assessing tumor characteristics.
- To guide surgical decisions based on tumor properties.
Main Methods:
- Immunohistochemical staining of tissue sections using monoclonal antibodies (DBA, SBA, PNA, UEA, Cytokeratin).
- Flow cytometry to analyze the chromosomal pattern of tumor cells.
- Intra-operative frozen section analysis.
Main Results:
- Immunohistochemistry suggests a collecting duct origin, distinct from proximal tubular epithelium.
- A diploid chromosomal pattern in oncocytic cells is associated with well-circumscribed tumors.
- These findings support the feasibility of kidney-sparing surgery.
Conclusions:
- Immunohistochemistry aids in determining the histogenetic origin of renal oncocytomas.
- Flow cytometry is crucial for assessing chromosomal patterns.
- Kidney-sparing surgery is favored for renal oncocytomas with a diploid pattern and favorable tumor characteristics.