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(A) A scant pretreatment biopsy of a tumor with IRF2BP2-NTRK1 fusion (case 14) with prominent stromal hyalinization. The post-radiation resection specimen showed unusual morphology including (B) atypical epithelioid cells embedded in a hyaline matrix, (C) trabecular architecture, and (D) discohesive rhabdoid cells.
