14 May 2025
: Case report 
Novel Approach to Retro-Odontoid Pseudotumor Resection without Atlantoaxial Dislocation
Challenging differential diagnosis, Unusual setting of medical care, Rare disease
Jia Shao ABCDEFG 1, Yan Zheng Gao ABCDF 1*, Kun Gao ABCD 1, Ke Zheng Mao BDF 1, Xiu Ru Zhang BCD 1DOI: 10.12659/AJCR.946611
Am J Case Rep 2025; 26:e946611
Figure 1 (A, B) Hyper flexion and extension radiographs showed no instability of C1–C2. (C) Sagittal reconstructive computed tomography scan of the cervical spine showed cervical degeneration and multiple cysts in the upper cervical spine. A subaxial cervical stenosis was diagnosed based on the Pavlov ratio in C3–C7. (D, E) A huge mass was noted posterior to the dens. The mass was hypointense on T1- and T2-weighted magnetic resonance imaging (MRI). (F) Only the rim of the pseudotumor was enhanced on T2-weighted contrast-enhanced MRI.