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C-0765 - Postoperative regression of retro-odontoid pseudotumor after atlantoaxial posterior fixation: ten years of experience in patients with atlantoaxial instability.

J. Park, E. Lee, J. Lee, H. Kang; Bundang-gu, Seongnam-si/KR Type: Scientific Exhibit
Area of Interest: Musculoskeletal spine
Imaging Techniques: CT, MR
Procedure: Outcomes analysis
Special Focuses: Hyperplasia / Hypertrophy, Inflammation
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Aims and objectives: Retro-odontoid pseudotumors or peri-odontoid pseudotumors are mass-like lesions involving the odontoid process and its surrounding structures, including the anterior arch of the atlas and transverse ligaments.1 Many reports have shown associations between retro-odontoid pseudotumor and various disea[...]

Methods and materials: Study Population From July 2004 to August 2015, 175 patients with AAI underwent posterior fixation operations at Seoul National University Bundang Hospital. Electronic medical records (EMRs) and a picture archiving and communication system (PACS) were used to retrieve clinical information about the [...]

Results: Among the total of 164 patients included in our study population (104 females; age range, 3–76 years; mean age, 47 years), 38 patients had retro-odontoid pseudotumor (25 females; age range, 4–72 years; mean age, 57 years) at the preoperative evaluation. Of the 38 patients, three patients were diagno[...]

Conclusion: Our study has shown that the incidence proportion of retro-odontoid pseudotumor in patients with symptomatic AAI was 23.2%. All patients who underwent posterior fixation showed regression of the pseudotumor despite various underlying diseases and SIs of the pseudotumors on initial MRI. We conclude t[...]

Personal information:

References: 1. Landi A, Marotta N, Morselli C, et al. Pannus regression after posterior decompression and occipito-cervical fixation in occipito-atlanto-axial instability due to rheumatoid arthritis: case report and literature review. Clin Neurol Neurosurg 2013;115:111-6. 2. Maruyama H, Tanizawa T, Uchiyama S, [...]

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