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Table 1 Grading of the Electron Microscope Pillar Changes

From: Shedding some light on the use of mesh in gastroesophageal junction surgery

Grade Ultrastructural findings
I Dilation of the intermyofibrillar spaces
II Swelling of sarcotubular structures
III Focal degeneration of myofibrils
IV Extended disruption–degeneration of the muscle architecture