Electroencephalographic correlation of clinical,radioisotopic brain scan,CT scan and postmortem diagnosis

Fifty three cases of different neurological disorders were studied in children and EEG correlation was done with clinical findings, RI brain scan, CT scan, carotid angiography, postmortem and operative findings. EEG was abnormal in 36/53 cases (67·92%), CT scan in 28/35 cases (80%), RI brain scan in 17/21 cases (80·95%), carotid angiography in 3/3 cases (100%) and postmortem and operative procedures were helpful in 10 cases. Out of 35 cases of CT scan, good EEG CT scan correlation was observed in 16 cases (45·71%) (including 3 cases of idiopathic epilepsy) and in 9 cases (25·71%), although the EEGs were abnormal, they did not correlate well with the abnormality revealed in CT scan. In the remaining 10 cases (28·57%), there was poor EEG CT scan correlation. Out of 21 cases of RI brain scan, good RI brain scan EEG correlation was observed in 17 cases (81%) and poor correlation in remaining 4 cases (19%). Carotid angiographic and EEG correlation in all 3 cases (100%); postmortem EEG correlation in 2/2 cases (100%) and operative procedures EEG correlation in 6/8 cases (75%). In 2 cases of infratentorial space occupying lesions EEG was normal. It is concluded that EEG is a fairly useful, noninvasive investigation in various neurological disorders in children.