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Factors Influencing on Retro-Odontoid Soft-Tissue Thickness: Analysis by Magnetic Resonance Imaging.
MedLine Citation:
PMID:  23448899     Owner:  NLM     Status:  Publisher    
STUDY DESIGN.: A retrospective, consecutive case series. OBJECTIVE.: To analyze the relationship between retro-odontoid soft-tissue thickness and patients' age, sex, and degenerative changes of cervical spine and to investigate the effect these factors have on retro-odontoid soft-tissue thickness. SUMMARY OF BACKGROUND DATA.: Thickening of the soft tissue posterior to the odontoid process can form a retro-odontoid pseudotumor causing symptoms of spinal cord compression. Rheumatoid arthritis and long-term dialysis have been reported as possible causes for this. However, there have been reports of retro-odontoid pseudotumors without coexisting diseases. METHODS.: Findings from a total of 503 cases of cervical spine magnetic resonance images were reviewed, and retro-odontoid soft-tissue thickness was measured. The values were matched for age, sex, presence of degenerative changes, rheumatoid arthritis, and dialysis and were analyzed for significance. RESULTS.: Retro-odontoid soft tissue thickened with age, and this was also seen in male patients and patients with degenerative changes. Significant increase in thickness was also observed in patients undergoing dialysis and further increased with prolonged dialysis. There was no significant association with presence of rheumatoid arthritis. CONCLUSION.: There is association between age, sex, degenerative cervical spine changes, and dialysis with retro-odontoid soft-tissue thickness. With dialysis, retro-odontoid soft-tissue thickness increases with increasing duration. Thus, reviewing magnetic resonance image from daily practice indicates that cervical spine degeneration is associated with the development of retro-odontoid pseudotumors.
Shinjiro Tojo; Reina Kawakami; Takenori Yonenaga; Daichi Hayashi; Kunihiko Fukuda
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Publication Detail:
Journal Detail:
Title:  Spine     Volume:  38     ISSN:  1528-1159     ISO Abbreviation:  Spine     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-3-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7610646     Medline TA:  Spine (Phila Pa 1976)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  401-406     Citation Subset:  -    
From the Department of Radiology, The Jikei University School of Medicine, Tokyo, Japan.
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