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(A) Tumor composed of oval to spindle-shaped cells having a high nucleocytoplasmic ratio, prominent nucleoli, and a moderate amount of eosinophilic cytoplasm along with unremarkable urothelial lining epithelium and increased mitotic figures (H&E, ×400). (B) Anaplastic lymphoma kinase immunohistochemistry revealed strong cytoplasmic staining of the myofibroblasts (×400).
