Comparison of CT and conventional neuroradiological procedures in lesions in the proximity of the tentorial hiatus.

Seventeen cases with (obstructive) lesions in the region of the tentorial hiatus were examined with an EMI CT 1010 brain scanner, of which 8 had additional intrathecal metrizamide. Findings were compared with information received from angiographic studies and conventional contrast examinations of the intracranial CSF spaces and with CT scans of patients presenting with herniation at the tentorial hiatus. CT, including enhancement and intrathecal metrizamide, did not yield optimal information about exact localisation or infiltrative growth of lesions. A combination with conventional procedures was needed in order to obtain essential information.