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Asymmetric Photic Response (Ipsilateral Suppression); Left Temporo-Occipital Tumor. A 4-year-old girl with medically intractable epilepsy caused by
tumor. Her seizures were described as pupillary dilatation, right facial distortion, and eyes deviating to the left side, followed by left arm stiffening and
shaking. (A) Axial FLAIR shows high signal abnormality over the right temporo-occipital region. (B) Sagittal view demonstrates hypointense lesion in the
left temporo-occipital region. EEG shows consistent asymmetry of photic driving response during all flash frequencies over the left occipital region that is
concordant with the location of the tumor in the left temporo-occipital region.
A mild and inconsistent
asymmetry
of photicActivity,
driving response
is frequently
Source: Focal
Nonepileptoform
Atlas of Pediatric
EEGseen in normal individuals. An asymmetry in photic driving response may result
from a lesion on the side of lower voltage, but an asymmetry in voltage only, although consistently lateralized, in the absence of other EEG changes can
Citation: Laoprasert P. Atlas of Pediatric EEG; 2011 Available at: http://mhmedical.com/ Accessed: May 15, 2017
be seen in some normal individuals and should not be viewed as abnormal.19
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