Fig. 3
From: Clinicopathological findings of pediatric NTRK fusion mesenchymal tumors
a Histology of the intracranial undifferentiated sarcoma with TPR-NTRK1 fusion shows alternating cellular areas with collagen bands show a tiger pattern-like appearance. The tumor cells are oval to short spindle cells. b The forehead mesenchymal tumor with LMNA-NTRK1 fusion shows relatively low cellular spindle cell mesenchymal tumor with keloid type collagen laydown. c The pulmonary inflammatory myofibroblastic tumor with ETV6-NTRK3 fusion shows bland-looking spindle cells with intermixed lymphoplasma cells. d A sacrococcygeal infantile fibrosarcoma with ETV6-NTRK3 fusion shows fascicular spindle cells with high cellularity (a-d: H&E, bar: a: 300, μm, b-d: 50 μm)