The authors report a 73-year-old woman who had spinal cord compression develop
because of hypoplasia of the atlas associated with a retroodontoid pseudotumor diagnosed …

A 38-year-old man presented with progressive cervical myelopathy due to atlas hypoplasia
associated with non-traumatic retro-odontoid mass. The neuroimaging findings suggested …

A retro-odontoid pseudotumor (ROP) is commonly associated with atlantoaxial subluxation
(AAS). Here, we report a patient with ROP but without AAS. The patient was a 72-year-old …

Introduction Congenital hypoplasia of the atlas has rarely been reported. Myelopathy
caused by the complete absence of the posterior arch of the atlas has not been reported …

Study Design. A retrospective review of 10 consecutive patients with a noninflammatory retro-
odontoid pseudotumor. Objective. To examine the radiographic characteristics in patients …

We describe CT and MRI of a previously unreported combination of atlantoaxial anomalies
consisting of posterior arch hypoplasia in a bipartite atlas with an os odontoideum, in a 30 …

✓ Retroodontoid or periodontoid pseudotumor unassociated with rheumatoid arthritis or
hemodialysis is clinically rare. The authors report three cases of retroodontoid pseudotumor …

A retro-odontoid pseudotumor (ROP) is commonly associated with atlantoaxial instability
(AAI) or rheumatoid arthritis (RA). However, we describe a patient with ROP in the absence …

Retroodontoid pseudotumor (ROP) is a nonneoplasic lesion of unknown etiology, commonly
associated with inflammatory conditions, and the term of pannus is usually used. Less …

A 58-year-old man presented with a 6-month history of progressive cervical myelopathy.
Magnetic resonance imaging and computed tomography of the cervical spine revealed a …