MRI FLAIR Changes in Total Resection of Olfactory Groove Meningiomas through Expanded Endonasal Endoscopic Approaches

Leo F. Ditzel Filho; Juan Carlos Fernandez-Miranda; Danielle de Lara; Bradley A. Otto; Amin B. Kassam; Ricardo L. Carrau; Daniel M. Prevedello

doi:10.1055/s-0032-1312252

Journal of Neurological Surgery Part B: Skull Base, Inhaltsverzeichnis

MRI FLAIR Changes in Total Resection of Olfactory Groove Meningiomas through Expanded Endonasal Endoscopic Approaches

Leo F. Ditzel Filho ¹(presenter), Juan Carlos Fernandez-Miranda ¹, Danielle de Lara ¹, Bradley A. Otto ¹, Amin B. Kassam ¹, Ricardo L. Carrau ¹, Daniel M. Prevedello ¹

¹Columbus, USA

Abstract

Background: olfactory groove meningiomas can grow insidiously and significantly compress the adjacent cerebral structures. One of the main challenges in their surgical management is achieving complete removal without further damage to the frontal lobes.

Objective: The purpose of this study is to analyze and describe cerebral edema and FLAIR signal changes in MR imaging of olfactory groove meningiomas totally resected through EEA.

Methods: Pre- and postoperative films of 20 consecutive olfactory groove meningiomas completely removed through EEA were reviewed. Tumor volume as well as pre- and postoperative FLAIR signal change volumes, was assessed using the DICOM image viewer OsiriX.

Results: Mean tumor volume was 26.2 cm³ (±22.7), mean preoperative FLAIR change volume was 39.1 cm³ (±44.9), and mean postoperative FLAIR change volume was 4.2 cm³ (±5.9). In1 of the 20 cases analyzed (5%) there was increase of signal changes postoperatively, all other patients demonstrated image improvement.

Conclusions: EEA appears to be a safe and effective method for total removal of olfactory groove meningiomas. FLAIR signal changes tend to resolve after tumor resection and do not seem to worsen with this operative technique. Further comparative studies are necessary to determine whether this feature differs from open approaches.

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