title: Radiological predictive factors for regrowth of residual benign meningiomas.
abstract: The pre- and postoperative radiological predictive factors for the regrowth of residual benign meningiomas were investigated in 80 of 327 patients who underwent first surgery for intracranial meningioma, who met the following conditions: residual tumor observed on postoperative imaging, follow up for more than 5 years or until regrowth of the residual tumor, histological diagnosis of World Health Organization grade I, and no additional therapy performed within 1 month after surgery. These 80 patients were divided into those with no regrowth during the follow-up period (Group A, n = 54) and those with regrowth (Group B, n = 26), and the clinical characteristics and pre- and postoperative imaging findings were compared. Univariate analysis of factors influencing regrowth showed 6 factors were significant: tumor size ≥4 cm (p = 0.043), tumor volume ≥30 cm(3) (p = 0.026), presence of edema (p = 0.036), unclear brain-tumor interface (p < 0.001), presence of a pial-cortical blood supply (p = 0.031), and residual tumor volume ≥3.0 cm(3) (p < 0.001). Multivariate analysis showed only residual tumor volume ≥3.0 cm(3) was significant (p = 0.001). Generally, the significant imaging findings on univariate analysis suggest malignant meningioma. Similar findings may be observed even in grade I cases, and residual tumors may regrow in such cases. The possibility is particularly high if the residual tumor volume exceeds 3.0 cm(3), so early radiotherapy should be performed to prevent regrowth.
authors.affiliation: Department of Neurosurgery, Okanami General Hospital, Japan.
authors.forename: Takatoshi
authors.initials: T
authors.lastname: Fujimoto
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Ishida
authors.forename: Yoshitomo
authors.initials: Y
authors.lastname: Uchiyama
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakase
authors.forename: Toshisuke
authors.initials: T
authors.lastname: Sakaki
authors.forename: Mitsutoshi
authors.initials: M
authors.lastname: Nakamura
authors.forename: Young-Su
authors.initials: YS
authors.lastname: Park
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Motoyama
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Nishimura
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D008137:Longitudinal Studies; D008279:Magnetic Resonance Imaging; D008297:Male; D008577:Meningeal Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery; D008579:Meningioma / Q000000981:diagnostic imaging* / Q000601:surgery; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis* / Q000517:prevention & control; D018365:Neoplasm, Residual / Q000000981:diagnostic imaging / Q000473:pathology*; D011237:Predictive Value of Tests; D011859:Radiography; D055815:Young Adult