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Distribution of HG types, namely single gyrus (single), common stem duplication (CSD), complete posterior duplication (CPD), and multiple gyri (multiple) in both hemispheres.
| Types of HG | Number in LH (%) | Number in RH (%) |
| Single | 20 (47.6%) | 14 (33.33%) |
| CSD | 4 (9.5%) | 4 (9.5%) |
| CPD | 12 (28.6%) | 7 (16.66%) |
| Multiple | 6 (14.3%) | 17 (40.5%) |
| Total | 42 (100%) | 42 (100%) |
