Coronal computerized angiotomography for the diagnosis of isodense chronic subdural hematoma.

The authors demonstrate the value of coronal computerized angiotomography for the diagnosis of and screening for isodense chronic subdural hematoma. Specific features of coronal computerized angiotomograms include 1) thick lines of high density with slight convexity; 2) lines of high density parallel with the inner table of the skull; or 3) high-density dotted lines away from the inner table. These high-density lines or dots represent the superficial cerebral veins and cortical branches of the middle cerebral artery, which have been displaced by the hematoma. When these characteristic features are revealed on noninvasive coronal computerized angiotomography, cerebral angiography may be unnecessary.