ETV6 and mesenchymal cell neoplasm: In a cohort of 30 paediatric NTRK-rearranged mesenchymal tumours, Davis et al. (7) characterized the clinicopathologic features of 12 classic ETV6-NTRK3 fused infantile fibrosarcoma and 18 variant paediatric NTRK-rearranged mesenchymal tumours.