case_images: PMC6243362_01
case_images: Sagittal section T2 weighted MR image of the upper cervical spine and posterior cranial fossa demonstrating peg-like cerebellar tonsils positioned 25 mm beyond the foramen magnum.
case_images: bjrcr.20160016.g001.jpg
case_images: PMC6243362_01_bjrcr.20160016.g001.jpg
case_images: fig1
case_images: The posterior fossa was mildly underdeveloped but there was no evidence of SHM (Figure 1).
case_images: Sagittal section T2 weighted MR image of the upper cervical spine and posterior cranial fossa demonstrating normal tonsillar position and morphology.
case_images: bjrcr.20160016.g002.jpg
case_images: PMC6243362_01_bjrcr.20160016.g002.jpg
case_images: fig2
case_images: Surprisingly, a follow-up MRI showed that the CM1 had resolved (Figure 2).