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Schematic drawings of operative findings of membranous structures on the tumour in Stage 3 (A) and Stage 4 (B). Asterisk = arachnoid fold caused by the retractor (R).

Schematic drawings of operative findings of membranous structures on the tumour in Stage 3 (A) and Stage 4 (B). Asterisk = arachnoid fold caused by the retractor (R).