Figure: Representative radiological findings, HCP patients.

1A : Periventricular leukomalacia. T2-weighted MRI axial image, case 40 (proportional HCP). Note marked effacement of white matter in centroposterior portion of the right hemisphere, with corresponding enlargement of the body and trigonal regions of the lateral ventricle (PVL2). In addition, the white matter adjacent to the trigonal portion of the left lateral ventricle is thinned (arrow, PVL1).

1B: MCA territory infarct. FLAIR MRI axial image, case 8 (arm-dominant HCP). Note large encephaloclastic lesion of the left hemisphere involving cortex and white matter. The pathologic changes are primarily in the distribution of the middle cerebral artery.

1C: Porencephaly. Axial CT image, case 36 (proportional HCP). Note extensive area of porencephaly in the left temporo-occipital white matter adjacent to the trigonal region of the lateral ventricle, extending to the cortex.

1D: Polymicrogyria. Axial CT image, case 3 (arm-dominant HCP). Note the reduced volume of the right hemisphere with enlargement of the body of the lateral ventricle. The cortical grey matter in the right middle cerebral artery territory is abnormally folded and thicker than normal; the right sylvian fissure is abnormally large and open.