acy of the CT scan in comparison to plain skull iwaphy. angiography and radionuclide siudiis in se cases examined. Plain skull radiography iden-

tified the presence of a tumor in 72%, and was specific for meningioma in 46%. Angiograpily iden- tified the presence of tumor in 93% and was specific for meningioma in 73%. Radionuclide bram scanning m 40 of the cases gave an accuracy for an intra- cranial tumor of 90% and was specific for menin-

e computed tomographic scan

tomatology, were the exceptions 80 the finding of edema around the abscess following contrast en- hancement.

Robert A. Zimmerman, M.D. tIospital of the University of Pennsylvania

Computerized axial tomography In chronic seizure dlaorckws of chiidhooc! Ekchman OS, Hodges FJ, Freeman JM (-4~ Johns Hopkins University School of Medicine, Baltimore, Maryland) Pediatrics 58:828- 832, December 1976

‘The authors retrospectively examined the first 98 children having CT scans for the diagnosis of chronic seizures. The patients varied in age from 3 months to 20 years with a mean age of 11 years. The mean length of the seizure disorder was 6.7 years. All

&7ietats. The diregtaosis was contirmed on 281 pa- tients.

Brain tumors are readily dete!:table with CAT, @WtidaFly WheR thQ’ ;%F.‘Z bCatd iR the RiidiRe Or

posterior fossa. Some degree of differentiation of the type of neopiasm is possibk a4td iocreases the value of CAT. In the case’ of cerebrovascular disease the two studies are synergistic; however, CAT is superior. showing intrkrebral hemorrhage. CAT proved to be more US&II in the invesiigaiicltr oi veti&& Gc-

generative disease. In the case where both radio- nuclide scan and CAT are negative, the possibility of the existence of intracranial parenchymal disease (with the exception of vascular diseases such as ar- teritis and zneurysm) is quite remote. In th:: 133 ps-