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Table 1 Comparison between the four borders of the ring of the direct umbilical hernia as regard the predominance of the transverse collagen fibres (number of cases)

From: Structure of direct and indirect umbilical hernia and the implication on surgical repair in children

Border Transverse collagen fibres
Upper 15 (75%)
Lower 14 (70%)
Right 8 (40%)
Left 6 (30%)