Four imaging studies obtained in the same patient with seizure disorder. (A) Ictal axial SPECT image obtained after the intravenous administration of Tc-99m.

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Four imaging studies obtained in the same patient with seizure disorder. (A) Ictal axial SPECT image obtained after the intravenous administration of Tc-99m ECD demonstrates an area of hyperperfusion in the left temporal lobe (arrow). (B) Interictal axial SPECT image with Tc-99m ECD demonstrates hypoperfusion in the left temporal lobe (arrow). (C) Interictal axial F-18 FDG PET image demonstrates asymmetry, with relatively decreased glucose metabolism in the left temporal lobe (arrow) in comparison to the right temporal lobe. (D) Axial MRI image demonstrates reduced volume in the left hippocampus (arrow). Source: Introduction to Nuclear Medicine, Introduction to Diagnostic Radiology Citation: Elsayes KM, Oldham SA. Introduction to Diagnostic Radiology; 2015 Available at: https://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/Books/1562/Elsayes_Ch02_Fig-02-34.png&sec=95875655&BookID=1562&ChapterSecID=95875470&imagename= Accessed: October 12, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved