metanephric stromal tumor


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  • Histology

    • spindle cells
    • onion-skinning around entrapped renal tubules and vessels +/- angiodysplasia
    • juxtaglomerular cell hyperplasia in 25%
    • heterologous elements in 20% (glia, cartilage)

  • Stains

    • CD34+
    • desmin, CK, S100 negative
    • heterologous glia stains for GFAP, S100
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