PMC7139628_01
MRI scan sections of the patient's brain reporting the presence of GMH (indicated by arrows and circles). (A) T2W - coronal section; (B) T1W- assial section; (C) T1W - sagittal section. Arrows indicate areas of subependimal alterated signal (bilateral and asymmetrical PNH:Periventricular Nodular Heterotopia:with heterotopic grey matter stretching all along the ventricular walls, maximum diameter = 5 mm). Note that the shade of grey is the same as that of the cortical grey matter (the same signal intensity), which confirms that it is grey matter:the pathognomonic finding in GMH.
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