![]() The mean difference between the two groups was 5.6cm3. Two were classified as PR according to T2W volume and STR according to T1-T2 volume (Table 1). ![]() Three patients were classified as Partial Resection (PR) according to T2W volume and STR according to T1-T2 volume. Results: Based on the two imaging techniques for residual tumor volume, 1 patient was classified as Subtotal Resection (STR) according to T2W volume and Gross Total resection (GTR) according to digital subtraction T1-T2 volume. The volumes of tumor residual and qualitative EOR calculated by this technique were compared to the volumes based on T2W images only, which were interpreted by a neuroradiologist. Volumetric analysis for EOR was calculated based on the volume calculated from the subtraction images. A publicly available post-processing radiographic software “OsiriX” was used to digitally subtract postoperative T2W from T1W sequences. All lesions were hypointense on T1-Weighted (T1W) and hyperintense on T2W and FLAIR sequences. Methods: Twelve patients with DLGG were included in the study. In this study we propose a novel technique using OsiriX for evaluation of the postoperative EOR of DLGG. Background: The extent of resection (EOR) of Diffuse Low Grade Gliomas (DLGG) is often challenging to assess due to post-operative hyperintensity of the resection cavity and artifacts on T2-Weighted (T2W) and Fluid-Attenuated Inversion Recovery (FLAIR) sequences.
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