Related Experiment Videos
Spinal epidural abscess: evaluation with contrast-enhanced MR imaging
1Department of Radiology, University of California, San Francisco 94143-0628.
Abstract:
Seven patients with spinal epidural abscess were evaluated with MR imaging. T1-weighted images were obtained before and after administration of gadopentetate dimeglumine, and contrast-enhanced images were compared with available T2-weighted images and unenhanced T1-weighted images. In all seven cases, the epidural infection was iso- to hypointense compared with the spinal cord on unenhanced T1-weighted images, and increased in intensity on proton-density- and T2-weighted images. Three patterns of enhancement were observed after contrast administration. In three patients the infection enhanced homogeneously, likely representing thickened, inflammed tissue with microabscesses and granulomatous material. In one patient, peripheral enhancement surrounded a central focus of low signal intensity, representing necrotic abscess. In two patients, a combination of both patterns was observed. One abscess infiltrated the posterior thoracic epidural fat, producing decreased signal within the high-signal fat on T1-weighted images. Enhanced T1-weighted images were equivalent to unenhanced T2-weighted images in detecting the extent of epidural involvement in three cases. In two cases, enhanced T1-weighted images were superior to T2-weighted images in differentiating the infectious component from surrounding CSF. In one case, contrast administration produced no discernible enhancement. Enhanced images also provided important information regarding the composition of the abscess (liquid versus solid). Contrast-enhanced MR images are valuable in the characterization of spinal epidural abscesses.
Insights
Contrast-enhanced MRI is valuable for characterizing spinal epidural abscesses. Gadolinium-enhanced T1-weighted images help differentiate infection from surrounding fluid and assess abscess composition.
Area of Science:
- Radiology
- Neurology
- Infectious Diseases
Background:
- Spinal epidural abscesses (SEAs) are serious infections requiring accurate diagnosis.
- Magnetic Resonance (MR) imaging is crucial for evaluating SEAs.
- Understanding enhancement patterns is key to characterizing SEA components.
Purpose of the Study:
- To evaluate the utility of contrast-enhanced MR imaging in characterizing spinal epidural abscesses.
- To compare the effectiveness of enhanced T1-weighted images with T2-weighted and unenhanced T1-weighted images in assessing SEA extent.
- To determine if enhanced MR imaging can differentiate between liquid and solid abscess components.
Main Methods:
- Seven patients with spinal epidural abscess underwent MR imaging.
- T1-weighted images were acquired before and after gadopentetate dimeglumine administration.
- Contrast-enhanced images were compared with T2-weighted and unenhanced T1-weighted images.
Main Results:
- SEAs were iso- to hypointense on unenhanced T1-weighted images and hyperintense on T2-weighted images.
- Three enhancement patterns were observed: homogeneous, peripheral, and combined.
- Enhanced T1-weighted images aided in differentiating infection from cerebrospinal fluid (CSF) and assessing abscess composition.
Conclusions:
- Contrast-enhanced MR imaging is valuable for characterizing spinal epidural abscesses.
- Enhanced T1-weighted images provide crucial information regarding SEA extent and composition.
- MR imaging with contrast improves diagnostic accuracy for spinal epidural abscesses.