Article Figures & Data
Figures
- Fig 1.
Axial T2-weighted MR images.
A, Image in a 21-month-old girl with grade 0 myelination in the frontal lobe. The subcortical white matter is clearly hyperintense, so not myelinated, in the prerolandic area and along the first and second convolutions bilaterally. Subcortical hyperintensity was also evident in the frontopolar regions.
B, Example of grade 2 myelination in the frontal area. A T2 hyperintensity is present along the first and second convolutions, while the prerolandic area is myelinated.
C, Example of grade 3 myelination. T2 hyperintensity is no longer evident, and myelination appears complete.
- Fig 2.
Histogram of frontal lobe myelination. Numbers on x axis are ages in months.
- Fig 3.
Histogram of temporal lobe myelination. Numbers on x axis are ages in months.
- Fig 4.
Histogram of parietal lobe myelination. Numbers on x axis are ages in months.
- Fig 5.
Histogram of peritrigonal area myelination. Numbers on x axis are ages in months.
- Fig 6.
A and B, Axial T2-weighted MR images show grade 0 myelination in the temporal lobe. Subcortical T2 hyperintensity is recognizable in both temporopolar (A) and temporolateral (B) areas.
- Fig 7.
Axial T2-weighted MR image shows peritrigonal linear areas of hyperintensity that can be referred to perivascular spaces.
Tables
Subdivision of marker sites and summary of grading system
Grade Marker Sites Frontal Lobe Temporal Lobe Parietal Lobe Peritrigonal Area Pre-R Polar I–II Lateral Polar Post-R Gyri Posterior Superior 0 − − − − − − − − − 1 + − − + − + − + − 2 + + − + + + + + + 3 + + + Note.—R indicates rolandic; I–II, first and second convolutions; +, presence of myelination (absence of T2 hyperintensity); −, absence of myelination (presence of T2 hyperintensity).
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