Download Clinical Computer Tomography: Head and Trunk by K. Ungerer (auth.), A. Baert, L. Jeanmart, A. Wackenheim PDF

By K. Ungerer (auth.), A. Baert, L. Jeanmart, A. Wackenheim (eds.)

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Extra resources for Clinical Computer Tomography: Head and Trunk

Sample text

Note invasion of chiasm and thickening and tortuosity of optic nerves Empty Sella and Pituitary Gland 1. L. Dietemann and A. Wackenheim It is no longer necessary to pOint out the important practical value of tomodensitometry (TDM) for diagnosing empty sellae nor the great advantage of being able to measure the density of the intrasellar contents. In practice it is now very easy to distinguish the intrasellar densities of the parenchyma from the liquid-like densities and thus argue in favour of either a hypophysial tumoral mass or an intrasellar liquid mass, the so-called "empty sella".

They are well-defined, slightly hyperdense or isodense, and are surrounded by a hypodense edematous area which is sometimes very large. 2). 3). This allows an easy differential diagnosis between para sagittal and falx meningioma; a possible invasion of the sinus may also be suspected. 5). 4). 6). S). This intracerebral hematoma develops progressively into a well-defined hypodense image. Moreover subarachnoid bleeding is also clearly demonstrated on CT images: The importance of CT may be in its prognostic value for secondary ventricular enlargement which is clearly demonstrated on follow-up scans.

The ventricular dilatation persists or even increases: the shunt is operating inadequately due to either a non-patent catheter or a patent but nonfunctional catheter; it is impossible to know which. 3. Ventricular lobulation: there are postinfectious adhesions. However, the mere control of the thickness of the cerebral parenchyma constitutes real progress. Atrophies With tomodensitometry it is possible to differentiate cortical atrophies from corticosubcortical atrophies, the latter being either localized or diffuse.

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