Autoimmune glial fibrillary acidic protein (GFAP) astrocytopathy
Jun. 14, 2021
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Crowding of the posterior fossa manifests by narrowing of the prepontine space (orange arrow), flattening of the pons (black arrow), and decrease of the mamillopontine distance (blue arrow). Tonsillar ectopia is noted by the green arrow. (Contributed by Dr. Simy Parikh.)