Malignant solitary fibrous tumor of the kidney: report of a case and comprehensive review of the literature.

Abstract:

:Renal solitary fibrous tumors (SFTs) have been reported infrequently. We report a 76-year-old man with a left renal mass that had previously been shown radiographically to be stable, but was now growing. Grossly, the mass measured 12 cm, was poorly circumscribed, and invaded beyond the renal capsule. Approximately 10% of the neoplasm consisted of haphazardly arranged spindle cells admixed with dense collagenous bands, which is typical of benign SFT. However, the remainder of the mass was composed of pleomorphic, spindled sarcoma cells with frequent mitoses and foci of necrosis. Immunohistochemically, we observed CD34 labeling in the benign SFT component with loss of expression in the sarcomatous component, focal labeling for Bcl-2 protein in both areas, and absence of labeling for cytokeratin, renal cell carcinoma marker, S100 protein, CD117, and muscle markers in both areas. To our knowledge, this is the first reported case of malignant renal SFT, likely representing transformation from a histologically documented benign SFT component.

journal_name

Arch Pathol Lab Med

authors

Fine SW,McCarthy DM,Chan TY,Epstein JI,Argani P

doi

10.1043/1543-2165(2006)130[857:MSFTOT]2.0.CO;2

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

857-61

issue

6

eissn

0003-9985

issn

1543-2165

pii

CR5698

journal_volume

130

pub_type

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