Fig. 3

A 9-month-old boy with disseminated spinal leptomeningeal disease secondary to an intracranial ATRT. a Sagittal T2-weighted MRI of the spine demonstrates numerous extra-medullary, intraspinal tumour deposits (arrows). b Axial T2-weighted MRI of the lumbar spine demonstrate how these deposits (arrows) occupy the majority of the spinal canal, with the spinal cord (dashed arrow) anteriorly displaced, and (c) eventually becoming compressed at the cauda equina, where it is barely visible (dashed arrow). Emergency intrathecal chemotherapy and radiotherapy was subsequently performed