An Incidental Diffuse Midline Glioma Found at Autopsy.

This case shows an unexpected midline glioma found at autopsy. Two siblings were riding on a single bicycle on the side of a road. The 13-year-old brother was seated and steering the bicycle, while the 14-year-old sister held onto the back. The bicycle veered left into traffic and was struck by a vehicle. The siblings were admitted to the local Level 1 trauma center, but both later succumbed to injuries. Autopsies were performed on the children, including brains for neuropathologic evaluation. The brother was found to have an infiltrating astrocytoma located in the left middle cerebellar peduncle, with extension to the pons and medulla. His hospital course included several imaging studies using CT and MRI modalities. However, this lesion was not identified until the postmortem neuropathologic examination. This rare case shows the continued need for postmortem autopsy and the current limitations of medical imaging.