Retro-odontoid pseudotumor without atlantoaxial subluxation |
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| Authors: | Shingo Tanaka Mitsutoshi Nakada Yutaka Hayashi Masanao Mohri Yasuhiko Hayashi Naoyuki Uchiyama Jun-ichiro Hamada |
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| Institution: | 1. Department of Spinal Surgery, The Affiliated Hospital of Medical College, Qingdao University, Qingdao, China 266003;2. Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL 60612, USA;3. Party Community Office, The Affiliated Hospital of Medical College, Qingdao University, Qingdao, China 266003;4. Department of Orthopaedic Surgery, Peking University Third Hospital, Beijing, China 100191;1. Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA;2. Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA;1. Vascular Surgery Department, Hotel-Dieu de France, Beirut, Lebanon;2. Radiation Oncology Department, Gustave Roussy Cancer Campus, Villejuif, France;3. Radiology Department, Hotel-Dieu de France, Beirut, Lebanon |
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| Abstract: | 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 man who did not have a history of rheumatoid arthritis or trauma to the head and neck. The patient was admitted to our hospital with gait disturbance, progressive motor weakness in both upper extremities and sensory disturbance in all four extremities. MRI showed a retro-odontoid mass with severe compression of the cervical spinal cord. A CT scan showed spondylotic changes in C5, C6, and C7 and bilateral facet fusion between C3 and C4. Dynamic radiography showed no evidence of AAS; there was loss of mobility at C2–C7 and excessive mobility at C1. Intraoperative pathological examination revealed that the lesion was a pseudotumor; therefore, posterior C1–C2 fixation was performed. MRI performed 6 months after the operation revealed that the pseudotumor was markedly reduced. To the best of our knowledge, patients with ROP without AAS are uncommon. |
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