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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: J Child Neurol. 2015 Jul 16;31(3):309–320. doi: 10.1177/0883073815592222

Figure 1. MM-associated hydrocephalus. A–D: Classic Chiari II malformation.

Figure 1

Sagittal T1 MRI image (A) demonstrating classic features of a Chiari II malformation including elongated pons and downwardly displaced medulla, tectal beaking, small posterior fossa with vertically oriented tentorium, with cerebellar tonsillar ectopia below the foramen magnum line. Axial l T2 images (B–D). Note patency of aqueduct in B (arrow). E–H: Chiari II with aqueductal compression. Sagittal T1 image (A) demonstrating similar anatomic configuration as A, but with more prominent posterior fossa crowding and aqueductal compression. Axial T2 images (F–H). Note absence of patent aqueduct in F (arrow).