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腎粘液管状紡錘細胞癌(mucinous tubular and spindle cell carcinoma:MTSCC)はWHO 2004分類から独立した疾患として記載され,報告も増えている。2004年のWHO分類では低悪性度(low grade)と記載されたが,2016年のWHO分類で低悪性度という記載は削除された。MTSCCは低悪性度が典型であるが,今回,高悪性度(high grade)と診断されたMTSCCを経験したので報告する。
Mucinous tubular and spindle cell carcinoma(MTSCC)is a rare subtype of renal cell carcinoma that is typically a low-grade tumor. We report a case of high-grade MTSCC with metastasis. The tumor showed a prolonged enhancement on CT/MRI that was typical of MTSCC. However, preoperative diagnosis was difficult because the tumor had little high T2 signal intensity area that was suggestive of “mucin” as a typical MTSCC. Both radiologically and pathologically, the cranial and caudal sides of the tumor showed different features.
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