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Histologic features:
- may be more cellular than the classical form of mesoblastic nephroma
- cells may be polygonal or spindled.
- margins may appear to be more "pushing" than infiltrative
- high mitotic rate (8-30 mitoses per 10 high power fields)
- cysts are more commonly seen in this variant than in the classical form of mesoblastic nephroma.
The cellular variant has been considered by some to carry a worse prognosis: however, to date, the evidence seems to suggest that as long as surgical resection is complete, both the classical and cellular forms of mesoblastic nephroma behave in a benign fashion
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