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(a) Excess volume excised with a spherical excision compared to an ideal excision volume for each shape category (sphere vs. disk, p < 0.001 ; sphere vs. segmental, p < 0.001; sphere vs. irregular, p = 0.003). (b) Excess volume excised using hypothetical spherical excision vs. actual excess volume excised with supine MRI guided surgery (sphere, p = 0.05; disk, p < 0.001 ; segmental, p = 0.06 ; irregular, p = 0.08 )
