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A case of anterior mediastinal desmoid-type fibromatosis Miyuki Kambe 1,2 1Department of Radiology Kanagawa Cardiovascular and Respiratory Center Keyword: デスモイド型線維腫症 , 前縦隔腫瘤 pp.143-147
Published Date 2026/1/10
DOI https://doi.org/10.18888/rp.0000003051
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A man in his 60s presented with dyspnea and was found to have a massive 24 cm anterior mediastinal mass on imaging. Computed tomography revealed a lobulated mass compressing the heart posteriorly with heterogeneous enhancement. Magnetic resonance imaging demonstrated T1-weighted isointensity with T2-weighted hyperintensity and restricted diffusion in hemorrhagic areas. Following CT-guided biopsy suggesting fibrous tumor, surgical resection via clamshell thoracotomy was performed, yielding a 2.65 kg tumor. Histopathology revealed spindle cell proliferation with collagen deposition and positive nuclear β-catenin immunostaining, confirming desmoid-type fibromatosis. Despite microscopically positive margins, adjuvant radiotherapy(60 Gy/30 fractions)was administered. The patient remains recurrence-free. Anterior mediastinal desmoid-type fibromatosis should be considered in differential diagnosis of mediastinal masses.


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電子版ISSN 印刷版ISSN 0009-9252 金原出版

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