Patient clinical data.

Location (F = frontal, T = temporal, P = parietal, PF = posterior fossa, SB = skull base); infiltrated tissues (nd = no identification possible on pathological examination as the tumor removal concerned its extension outside the invaded sinus; hence infiltration was stated on MRI or CT data only; sup longitudinal sinus = superior longitudinal sinus); WHO grade (II* = grade II according to the number of mitoses per field (Perry1999)11; pathology subtype (M = meningothelial, Mi = microcystic, T = transitional, P = psammomatous, S = secretory).