Computerized tomography in the diagnosis of intracranial bleeding
The value of the CT scan in the diagnosis of intracranial hemorrhage is well-documented. A fresh hemorrhage appears as a circumscribed area of increased absorption that diminishes in density as the hematoma ages. As the absorption coefficient decreases, a stage will be reached when the lesion density equals that of the surrounding brain tissue. In subdural hematomas it is estimated that this isodense phase occurs two to six weeks postbleed. During this period, angiography may, therefore, continue to be of value in the diagnosis of hemorrhagic lesions. Although quite helpful when positive, false negative computerized tomography may be misleading in hemophilia or other hemorrhagic conditions.
Singer, HS; Kinney, TR; Zimmermann, RA
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