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Rectal biopsy. (A) Immunohistochemistry (IHC) showed AE1/AE3(−), Vim(3+), CK7(−), CK19(−), CK20(−), p40(−), Syn(−), CgA(1+), S100(3+), SOX10(3+), Melan-A(3+), CD99(2+), Ki-67(70%); (B) fluorescence in situ hybridization (FISH) diagnosed EWSR1-rearrangement. IHC, ×200; FISH, ×400.
