PMC3425268_01
Gross-predominantly cystic appearance of teratoid kidney
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F1
A thin segment of normal kidney was seen compressed at periphery [Figure 1].
Giant cell reaction to keratin with blastema. (H and E, x400)
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F2
Microscopically, the tumor showed classical triphasic pattern with blastemal, epithelial, and mesenchymal components without anaplasia; about 75% of the tumor revealed areas of squamous differentiation with keratin pearl formation but without adnexal structures [Figures 2 and 3].
Squamous differentiation with keratin pearls. (H and E, x400)
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F3
Microscopically, the tumor showed classical triphasic pattern with blastemal, epithelial, and mesenchymal components without anaplasia; about 75% of the tumor revealed areas of squamous differentiation with keratin pearl formation but without adnexal structures [Figures 2 and 3].
Adipose tissue differentiation with foci of blastema. (H and E, x400)
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F4
There were also small foci of mature adipose tissue and glial tissue [Figure 4].