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Inflammatory myofibroblastic tumor with ETV6-NTRK3 fusion (case 1). The lung lesion is well circumscribed (Panel A). Note the storiform-type fibrosis (Panel B). On high-power the inflammatory cells dominate with only occasional stromal cells with vesicular nuclei (Panel C); storiform-type fibrosis is also seen. Immunohistochemical stain for IgG4 showing an IgG4-rich infiltrate (Panel D).
