Fig. 4.
Salivary duct carcinoma with ETV6-NTRK3 fusion: a Infiltrative nests of apocrine-appearing cells with high-grade cytologic atypia and extensive comedo-necrosis. b Diffuse AR and BRST-2 were seen (AR shown here). c The case showed no evidence of secretory carcinoma or low-grade morphology and was S100 negative (shown here). d. FISH showed an ETV6 rearrangement (shown here) confirming the initial incidental finding of ETV6-NTRK3 by NGS