Computed tomographic evaluation of subdural and epidural metastases
Abstract:
Head computed tomography scans of eight patients with calvarial metastases revealed extension of the tumors into the epidural and subdural spaces; Epidural and subdural extensions enhanced after contrast medium administration and were either crescentic or biconcave. In six patients, these tumors produced sufficient mass effect to displace intraparenchymal structures. The subdural and epidural tumor extensions appeared similar to subdural and epidural hematomas, but could be diagnosed correctly because the former enhanced uniformly and were associated with destructive calvarial changes.
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01:10Computed Tomography
Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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01:14Imaging Studies I: CT and MRI
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Description of the Procedures
Computed Tomography (CT) scan:
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Description of the Procedures
Computed Tomography (CT) scan:
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01:27Imaging Studies III: Computed Tomography
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