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Histology samples stained with Masson trichrome. A, Grade 5 aneurysm (completely organized attenuated fibrous tissue) (original magnification, ×40). B, Grade 2 result for organized tissue in one-third to two-thirds of the dome area (original magnification, ×5). C, Grade 5 for the aneurysm dome and grade 0 for the neck area (original magnification, ×10). D, Grade 1 for organized tissue in less than one-third of the dome area (original magnification, ×5).
