Background Retro-odontoid pseudotumor (RP) can be caused by several diseases,
especially rheumatoid arthritis, and is usually associated with the presence of atlantoaxial …

Background and Objectives: To date, imaging characterization of non-rheumatic retro-
odontoid pseudotumors (NRROPs) has been lacking; therefore, NRROPs have been …

Study Design: Retrospective review. Objective: The aim of this study is to assess the
radiographic characteristics of patients with a retroodontoid pseudotumor and to evaluate …

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

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

Objective The authors present reports of 2 cases in which there was manifest atlantoaxial
instability and presence of retro-odontoid pseudotumor. The retro-odontoid tumor …

Objective Although a retro-odontoid pseudotumor associated with rheumatoid arthritis is a
well-known clinical entity, little is known about retro-odontoid pseudotumors not associated …

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 …

Purpose Retro-odontoid pseudotumor, not related to inflammatory or traumatic conditions, is
an uncommon pathology. Atlanto-axial instability has been advocated to explain the …

Purpose A retro-odontoid pseudotumor is usually a reactive fibrocartilaginous mass
associated with atlantoaxial subluxation (AAS). However, a retro-odontoid pseudotumor not …