Novel Approach to Retro-Odontoid Pseudotumor Resection without Atlantoaxial Dislocation

14 May 2025 : Case report China

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 1}

DOI: 10.12659/AJCR.946611

Am J Case Rep 2025; 26:e946611

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Table 1 Summary of retro-odontoid pseudotumor cases.

Year	Author [Ref]	Origin	No. of cases	Etiology	Unstable	Removed	Lamina removed	Fixation
1986	Sze []²	Neuro surg	3	Deg	Y	Y	C1	N
1991	Rosenberg []³	Neuro surg	2	Not clear	N	Y	C1–2	N
1996	Nishizawa []⁵	Neuro surg	1	Disk herniation	N	Y	C1–3	N
1997	Yamashita []²⁶	Ortho surg	1	Deg	N	N	C1	C0–C4
2002	Jun []⁶	Not clear	1	DISH	N	Y	Odontoid (trans oral)	C1–2
2004	Matsuno []²⁷	Neuro surg	1	Disk herniation	N	Y	C0–C1	N
2004	Oohori []²⁸	Ortho surg	1	RA	Y	Y	Unilateral C1–3	N
2006	Yamaguchi []²⁹	Ortho surg	3	RA	Y	N	C1	C0–C3
2006	Lagares []³⁰	Not clear	1	BI	Y	N	C0	C0–C3
2009	Chikuda []²³	Ortho surg	10	AAD	2 unstable	2 removals	C1	9 C0–C2
2017	Park []¹⁰	Ortho surg	38	AAD	Y	N	No	33 C1–25 C0–C2
2019	Venteicher []¹⁸	Neuro surg	2	Deg	N	Y	Odontoid	C1–2
2019	Naito []²⁰	Neuro surg	3	Cyst	N	Y	C1–2	N
neuro surg – neurological surgeon; ortho surg – orthopedic surgeon; deg – degeneration; DISH – disseminated idiopathic skeletal hyperostosis; RA – rheumatoid arthritis; BI – basilar invagination; AAD – atlantoaxial dislocation; N – no; Y – yes.

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