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Contrast-enhanced MR imaging with fat suppression in adult-onset septic spondylodiscitis
M Longo1, F Granata, K Ricciardi
1Institute of Radiological Sciences, University of Messina, Piazza Immacolata di Marmo, 4, 98121 Messina, Italy. longomar@tin.it
Abstract:
Spinal infections typically involve vertebrae as well as discs, and for this reason they are called septic spondylodiscitis. Magnetic resonance imaging is the most sensitive imaging method for the evaluation of this group of spinal diseases. The use of contrast-enhanced T1-weighted sequences with fat suppression, if correctly applied, may increase information provided by MRI. Firstly, this technique allows the primary vertebral focus, which often precedes disc involvement, to be identified at a very early stage. When the disease spreads, T1-weighted fat-suppressed gadolinium dimeglumine (Gd-DTPA) enhanced images provide macroscopic details of the primary vertebral focus, disc involvement patterns, and pathways of infection diffusion. All this information, when correlated with laboratory tests, may be useful in identifying the infectious agents (tuberculous vs piogenic forms), thus enabling a suitable therapy to be started. This technique is also useful in the assessment of the real extension of the disease, providing a clear depiction of paravertebral space involvement and of psoas muscle abscesses. Dangerous complications, such as meningitis, myelitis, and epidural abscesses, may be more promptly diagnosed and fully evaluated with fat-suppressed post-contrast T1-weighted images. Finally, this imaging technique may help to differentiate infectious processes from degenerative disorders, extradural neoplastic processes, and rheumatic diseases.
Insights
Contrast-enhanced MRI with fat suppression is crucial for diagnosing spinal infections like septic spondylodiscitis. This technique accurately identifies infection origins, spread, and complications, aiding in timely and appropriate treatment.
Area of Science:
- Radiology
- Infectious Diseases
- Spinal Imaging
Background:
- Spinal infections, termed septic spondylodiscitis, affect vertebrae and discs.
- Magnetic resonance imaging (MRI) is the primary diagnostic tool for spinal diseases.
- Contrast-enhanced T1-weighted MRI with fat suppression can improve diagnostic accuracy.
Purpose of the Study:
- To evaluate the utility of contrast-enhanced T1-weighted MRI with fat suppression in diagnosing spinal infections.
- To assess the technique's ability to identify early vertebral involvement and disease spread.
- To determine its role in differentiating infectious from non-infectious spinal conditions.
Main Methods:
- Application of contrast-enhanced T1-weighted MRI sequences with fat suppression.
- Analysis of images for primary vertebral focus, disc involvement, and infection pathways.
- Correlation of imaging findings with laboratory tests for etiological differentiation.
Main Results:
- Early identification of primary vertebral infection foci.
- Detailed visualization of disc involvement, infection diffusion pathways, and paravertebral/psoas abscesses.
- Improved diagnosis of complications like meningitis, myelitis, and epidural abscesses.
- Differentiation between infectious and degenerative, neoplastic, or rheumatic spinal disorders.
Conclusions:
- Contrast-enhanced T1-weighted MRI with fat suppression is highly effective for evaluating spinal infections.
- This technique aids in early diagnosis, staging, and differentiation of septic spondylodiscitis.
- It facilitates prompt and targeted therapeutic interventions by identifying infectious agents and disease extent.