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Normal axial CT scans of the brain, orbits, and lumbar spine from a young healthy man.
A. Image through the cerebral hemispheres at the level of the corona radiata. The dense bone of the calvarium is white. Gray matter appears denser than
white matter. The triangular shape of the sagittal sinus in axial section is seen posteriorly. B. Image at the level of the lenticular nuclei. The caudate and
lenticular nuclei are denser than the adjacent internal capsule. CSF within the frontal and occipital horns of the lateral ventricle as well as surrounding the
pineal body appears dark. Calcium is seen in the left choroid plexus and, to a slight extent, in the pineal. C. Image at the level of the posterior fossa. Again,
the CSF within
the fourth
ventricle
and prepontine
appearsDiagnosis,
dark. TheAdams
basilar and
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Source:
Chapter
2. Special
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Victor's
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9e focus anterior to the pons.
Typical artifact generated by temporal bones creates streaking across the inferior temporal lobes. The mastoid and sphenoid sinuses are black as a result
Citation: Ropper AH, Samuels MA. Adams and Victor's Principles of Neurology, 9e; 2009 Available at: http://mhmedical.com/ Accessed: April
of their aeration. D. Thin-section axial image through the midorbits. The sclera appears as a dense band surrounding the globe. Medial and lateral rectus
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muscles have a fusiform shape. Orbital fat appears dark because of its low attenuation value. Air contained within the sphenoid sinus and ethmoid air cells
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appears black. E. and F. Axial images of the lumbar spine following myelography. Contrast contained within the thecal sac appears white. The filling
defects are caused by nerve roots at the L3-L4 and L5-S1 levels. Bony structures appear dense, and the facet joints are well seen.