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A congenital mesoblastic nephroma that is characterized by increased cellularity, sheet-like proliferation of fibroblastic cells, and increased mitotic activity. There is a suggested linkage with infantile fibrosarcoma that is based on both containing the same t(12;15)(p13;q25) translocation, resulting in the ETV6/NTRK3 fusion. This type is associated with risk of recurrence.
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