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The role of magnetic resonance imaging in the diagnosis of postoperative spondylodiscitis.

BACKGROUND: Spondylodiscitis, discitis associated with vertebral osteomyelitis may follow disc-removal surgery. A targeted successful treatment of spinal infections requires clinical and laboratory data that are completed by the contribution of imaging procedures. Neuroimaging provides precise information on correct topography, localization, propagation, and differential diagnosis of spinal infectious lesions. The aim of this study was to present magnetic resonance imaging (MRI) findings in patients with postoperative spondylodiscitis.

METHODS: MRI was performed in 6 patients aged 29-50, with clinically suspected postoperative spondylodiscitis. Initial examination was performed 3-8 weeks after surgery and 3, 6, or 12 months after the treatment by antibiotics. Patients underwent MRI on a IT imaging unit (Siemens, Magnetom-Impact), including sagittal T1W and T2W images and axial T1W images before and after the administration of gadolinium contrast medium.

RESULTS: MRI findings included: significantly decreased signal intensity with the loss of distinction between vertebral body and intervertebral disc space on T1W, increased signal intensity in the adjacent vertebral body and end-plates on T2W, contrast enhancement of vertebral body and disc space and paravertebral soft tissue changes. Follow-up examinations performed 3, 6, or 12 months after the treatment showed less abnormal signal intensities on both T1- and T2-weighted images.

CONCLUSION: Postoperative spondylodiscitis is a rare but severe complication of lumbar disc surgery. Since conventional imaging techniques are not reliable for detecting spondylodiscitis in its early stages, MRI is of great significance in the diagnosis of postoperative spondylodiscitis.

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