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FIG 5. Case 6.
A and B, Fetal MR images obtained at 21 weeks’ gestation. Axial and coronal view T2-weighted images show a large left-sided extraaxial hemorrhage of variable signal intensity, with mass effect on the underlying cerebral hemisphere.
C and D, Fetal MR images obtained at 23 weeks’ gestation. Axial and coronal view T2-weighted images (26480/100) show the mixed signal intensity extraaxial hemorrhage with more clarity. Signal intensity change within the left parietal lobe can be seen, with breech of the overlying cortex and adjacent wall of the lateral ventricle representing an area of evolving porencephaly.
E and F, Fetal MR images obtained at 33 weeks’ gestation. Axial and coronal view T2-weighted images (42597/95.7) show further evolution and resolution of the left extraaxial hemorrhage. There is left temporoparietal porencephaly with ventricular communication. High signal intensity abnormality is now noted within the white matter of the right temporal lobe.
G and H, Cranial MR images obtained when the patient was 5 months of age. Axial and coronal view T2-weighted images (3420/168) show left temporoparietal porencephaly with ventricular communication and loss of cerebral substance. Ventriculomegaly can be seen. Persisting signal intensity abnormality can be seen within the white matter of the right temporal and parietal lobes. A new finding is of a neuronal migrational disorder with extensive polymicrogyria and areas of bandlike heterotopia with an almost "double cortex" appearance.
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