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CT scanning in middle fossa arachnoid malformations
Clinical Radiology
|March 1, 1978
Summary
Middle fossa arachnoid malformations are rare lesions identified on CT scans. These CSF-like cysts have distinct borders and minimal mass effect, often favoring the middle cranial fossa.
Area of Science:
- Neurology
- Radiology
- Neurosurgery
Background:
- Arachnoid malformations are congenital abnormalities.
- Middle cranial fossa is a common site for these lesions.
Observation:
- Computed tomography (CT) scans of six middle fossa arachnoid malformations were analyzed.
- Lesions presented with well-defined borders, CSF attenuation values (0–+8 EMI), and variable size.
- Minimal mass effect and no change after contrast administration were noted.
Findings:
- The anterior border often conforms to the greater sphenoid wing, and the posterior border merges into the Sylvian fissure.
- Middle cranial fossa arachnoid malformations exhibit characteristic imaging features on CT.
- These lesions demonstrate low attenuation similar to cerebrospinal fluid (CSF).
Implications:
- Accurate CT identification aids in diagnosis and management planning.
- Understanding imaging characteristics is crucial for differentiating from other pathologies.
- Further research into pathogenesis and clinical presentation is warranted.