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Low grade gliomas: comparison of intraoperative ultrasound characteristics with preoperative imaging studies

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Abstract

Thirty-three patients with low grade gliomas were evaluated with preoperative computed tomography (CT), magnetic resonance (MR) and intraoperative ultrasound (IOUS). Six patients had undergone previous surgical exploration. Tumor borders were marked with cortical letters and corresponding depths calculated. Resection of tumor corresponded to these ultrasound dimensions. The histology of biopsy specimens from tumor and ultrasound determined margins was studied on formalin fixed permanent sections using hematoxylin and eosin (H&E) and immunocytochemistry (GFAP).

Tumors were all seen on preoperative MR studies and most commonly showed a decreased T1 and increased T2 signal. Seven tumors showed variable enhancement with gadolinium. On CT two tumors were not seen, twenty-three tumors were hypodense and eight hyperdense. Three tumors showed variable CT contrast enhancement. All tumors were hyperechoic on ultrasound. Twenty-five (75%) tumors were well defined with distinct margins compared to adjacent brain. Eight tumors had poorly defined borders on ultrasound; five (62%) of these lesions had previously undergone surgeery. Eight tumors invaded functional brain identified by stimulation mapping techniques (e.g., speech cortex), thus limiting the resection. Five resections were limited because of involvement of important anatomical structures (e.g., corpus callosum). Of the remaining 20 tumors, seventeen (85%) had ultrasound defined margins that were histologically free of solid tumor (normal brain or sparse atypical cells only).

Low grade gliomas are readily identified and their margins well defined by intraoperative ultrasound regardless of preoperative imaging patterns. The results suggest that IOUS may enhance intraoperative delineation and extent of resection for low grade gliomas.

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Authors and Affiliations

  1. Departments of Neurological Surgery, University of Washington, Seattle, USA

    Peter D. Le Roux, Mitchel S. Berger & George A. Ojemann

  2. Departments of Radiology, University of Washington, Seattle, USA

    Keith Wang & Laurence A. Mack

Authors
  1. Peter D. Le Roux
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  2. Mitchel S. Berger
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  3. Keith Wang
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  4. Laurence A. Mack
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  5. George A. Ojemann
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Le Roux, P.D., Berger, M.S., Wang, K. et al. Low grade gliomas: comparison of intraoperative ultrasound characteristics with preoperative imaging studies. J Neuro-Oncol 13, 189–198 (1992). https://doi.org/10.1007/BF00172770

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