Platybasia and basilar invagination in osteogenesis imperfecta

MRI of the cranio-cervical junction
(A) Narrowing of upper cervical canal (white arrow) and myelomalacia at C2 (black arrow). (B) Tip of the odontoid and anterior arch of atlas are well above Chamberlain line (white line) and the clivus canal angle is <150° (yellow line).

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