A surgical case of primary mediastinal meningioma

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  • Taniguchi Yohei
    Division of Thoracic Surgery, Kansai Medical University Hirakata Hospital
  • Kaneda Hiroyuki
    Division of Thoracic Surgery, Kansai Medical University Hirakata Hospital
  • Nakano Takahito
    Division of Thoracic Surgery, Kansai Medical University Hirakata Hospital
  • Konobu Tosihumi
    Division of Thoracic Surgery, Kansai Medical University Hirakata Hospital
  • Miyasaka Chika
    Department of Pathology and Laboratory Medicine, Kansai Medical University Hirakata Hospital
  • Saito Yukihito
    Division of Thoracic Surgery, Kansai Medical University Hirakata Hospital

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  • 縦隔に生じた異所性髄膜腫の一手術例

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A 74-year-old woman presented with an abnormal shadow on a chest radiograph. Enhanced chest computed tomography showed a heterogeneous mass, 54 mm in diameter, in the anterior mediastinum. Positron emission tomography showed a slightly high fluorodeoxyglucose accumulation (maximum standardized uptake value 2.0). The preoperative diagnosis based on these findings was non-invasive thymoma, and we performed anterior mediastinal tumor resection with a median sternotomy. The cut surface of the resected tumor was grayish white and solid. Histopathologically, the tumor cells formed lobules and whorls, which showed immunopositivity for the epithelial membrane antigen, claudin-1, and vimentin. We diagnosed the tumor as an ectopic meningioma. Primary ectopic meningiomas are exceedingly rare. Only a few cases of mediastinal ectopic meningioma have been reported. We present a case of primary mediastinal meningioma that was treated by surgical resection.

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