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J Korean Radiol Soc. 1996 Feb;34(2):165-169. Korean. Original Article.
Jin U , Choi WS , Oh JH , Kim EJ , Yoon Y .
Department of Diagnostic Radiology, Kyung Hee University Hospital, Korea.

PURPOSE: This study was conducted to describe the postopertive MRI findings with contrast enhancement following anterior cervical fusion(ACF). MATERIALS AND METHODS: Thirteen patients after anterior cervical fusionsfor disc herniation or traumatic injury were studied with MRI 1 month to 10 months after operation. MRI findings were analysed with attention to the remained vertebral body, disc material, retropharyngeal soft tissue, grafted bone fragment, and biological orthopedic prosthesis(BOP). RESULTS: In 8/13 cases(62%), enhancement of the retropharyngeal soft tissue was seen with good demarcation between soft tissue and surrounding vertebra or disc.In 9/13 cases(69%), grafted bone or BOP was well defined by intersurface with low signal intensity. In 4 cases ofACF with bone graft, 2 cases(50%) showed heterogeneous or homogeneous enhancement of grafted bone fragments. Remained vertebral bodies and discs showed enhancements in 8/13 cases(62%). CONCLUSION: Postoperative MR findings after ACF included good margination of enhanced retropharyngeal soft tissue, grafted bone, and remained vertebral bodies/discs. The MRI could be a useful study to differentiate findings after ACF from posoperative inflammations such as spondylitis or discitis, and be a good imaging modality for follow up of grafted bony fragment or BOP.

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