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Case report: arachnoiditis following intracranial 'Thorotrast'
1Department of Neurological Surgery, Royal Preston Hospital.
Clinical Radiology
|February 1, 1992
Summary
Thorotrast, a contrast medium, caused a rare, progressive cauda equina lesion due to arachnoiditis over 30 years after brain injection. This condition, though uncommon, can lead to neurological deficits.
Area of Science:
- Neurology
- Radiology
- Pathology
Background:
- Arachnoiditis, an inflammation of the arachnoid mater, can result from contrast media introduced into the central nervous system.
- Thorotrast (thorium dioxide) was historically used as a contrast agent.
- Complications from contrast media can manifest years after administration.
Observation:
- A patient presented with a progressive, painless lesion affecting the cauda equina.
- The lesion was diagnosed as arachnoiditis.
- The patient had a history of Thorotrast administration into the brain over 30 years prior.
Findings:
- The cauda equina lesion was attributed to arachnoiditis caused by remote Thorotrast exposure.
- While contrast media in the lumbar spine can cause arachnoiditis, it rarely leads to significant clinical issues.
- This case highlights a very rare instance of progressive neurological deficit secondary to contrast-induced arachnoiditis.
Implications:
- This case underscores the potential for delayed and severe neurological complications from historical contrast media like Thorotrast.
- It emphasizes the importance of considering long-term sequelae of past radiological procedures in neurological diagnoses.
- Further investigation into the long-term effects of older contrast agents may be warranted.