A Meningioma with Hyperintensity on T1-Weighted Images in a Dog

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  • HASEGAWA Daisuke
    Department of Veterinary Radiology, Nippon Veterinary and Life Science University
  • KOBAYASHI Masanori
    Department of Veterinary Radiology, Nippon Veterinary and Life Science University
  • FUJITA Michio
    Department of Veterinary Radiology, Nippon Veterinary and Life Science University
  • UCHIDA Kazuyuki
    Department of Veterinary Pathology, University of Miyazaki
  • ORIMA Hiromitsu
    Department of Veterinary Radiology, Nippon Veterinary and Life Science University

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  • T1強調画像にて高信号を示した髄膜腫の犬の1例
  • Surgery: A meningioma with hyperintensity on T1-weighted images in a dog

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Abstract

A male six-year-old Pomeranian showed recurrent seizures and progressive left hemiparesis. MRI revealed a mass in the right paramedian frontal-temporal region with hyperintensity on T1-weighted (T1W) and mixed-intensity on T2-weighted (T2W) images. After gadolinium enhancement, the mass was enhanced homogenously and demonstrated the dural tail sign. Surgical resection of mass was performed and its histological diagnosis was meningioma. The meningioma of this case had a high cellular density with some lipid contents and intra- and extra-tumor hemorrhage, however, calcification was not found. These cellular characteristics may contribute to a higher signal intensity on T1W imaging.<br>

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