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a Encapsulated cystic tumor, Periodic acid-Schiff stain, 40× magnification. b Mucicarmine, 200×, highlights intraluminal mucin. c ETV6, fluorescence in situ hybridization showing nuclei with classic rearrangement pattern (one yellow fusion intact signal accompanied by a single split orange and green signal indicative of ETV6 rearrangement). Many nuclei showed a complex rearrangement pattern (two or more orange signals in addition to one green signal and one yellow fusion signal)
