Pathology: infantile fibrosarcoma

Sheets-fascicles of round-polygonal cells
Pale and eosinophilic cytoplasm
Round nuclei with small nucleoli and mild pleomorphism; inconspicuous mitotic activity
Dilated-ectatic blood vessels
Inflammatory infiltrate with lymphocytes and eosinophils
IHC: smooth muscle actin
RNA-seq: ETV6::NTRK3 gene fusion

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Soft Tissue Tumours

Fibroblastic & Myofibroblastic Tumours