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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).
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	+	+	+