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(A) MSO craniotomy was performed according to Reisch et al. (2) with a 2 × 2.5-cm extension. (B) Second, the MSO approach was extended to a PT approach according to Yaşargil et al. (21) with a size of 4 × 6 cm. (C) The craniotomy was enlarged (as our third step) for the exposure to the frontal midline.
