Abstract
Grossly, the tumors are solid, gray to tan in color, and homogenous on cut surface. Most tumors are well-demarcated but lack a capsule. Microscopically, the tumor is chiefly composed of tightly packed primitive tubules and acina, with frequent papillary or glomeruloid structures. The individual tumor cells have scant cytoplasm, round-to-oval nuclei with smooth chromatin, inconspicuous nucleoli. Stromal hyalinization, dystrophic calcification and psammoma bodies are occasionally seen. Mitotic figures are rare or absent. The tumor cells are positive for WT1, PAX2 and CD57, but negative for CK7, CD56 and AMACR.
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