Evaluation of intracranial space-occupying lesions by computed tomography and electroencephalography

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Until recently, the diagnosis or exclusion of intracranial space-occupying lesions required hospitalization of the patient and the utilization of several diagnostic techniques, some of them invasive, potentially harmful, and costly in time and effort. With the recent advent of computed tomography (CT), a noninvasive technique is now available.1, 2 CT has been generally accepted as a revolutionary method for the investigation of central nervous system diseases and, in particular, for the detection of intracranial tumors.3, 4 We have undertaken this study to compare the results of CT and electroencephalography (EEG) and determine their respective values and limitations in the noninvasive diagnosis of space-occupying lesions within the skull.

Materials and methods

One hundred sixteen patients with intracranial space-occupying lesions were studied. The data were obtained from log sheets containing information on all patients studied by CT and EEG, starting with the installation of the EMI scanner at the Cleveland Clinic in early 1974 and continuing for some months into 1975. The two procedures were almost always accomplished within the same week, often on the same day. All patients with the diagnosis of a space-occupying lesion confirmed by contrast neuroradiological procedures, craniotomy, or necropsy were included in this study. Patients with incomplete information or in whom the diagnosis was uncertain were excluded.

CT scans were made with an EMI scanner displaying an image in a matrix of 160 × 160 elements. Tomographic cuts were separated by 2.5-cm intervals and obtained at an angle of 20° to 30° in relation to the orbitomeatal line. In . . .



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