Bone and soft tissue Case 2. Skull base mass from a 5 YO patient.

•Focal positivity for cytokeratin, brachyury, S100, SMA

•INI1/SMARCB1 loss on immunohistochemical stain as well as SMARCB1 deletion on NGS

•Diagnosed as poorly diff chordoma, but malignant rhabdoid tumor cannot be ruled out.