併発性TTRとALアミロイドーシス:診断上の課題と臨床的影響

Karan Wats¹, Rajshekhar Chakraborty², Mariela Navarro-Torres³

¹Division of Cardiology, Department of Medicine, Columbia University Irving Medical Center, New York, New York, USA.

JACC. Case reports

|September 5, 2025

まとめ

このケースは,トランスチレチン (TTR) アミロイドーシスとライトチェーン (AL) アミロイドーシスを区別する診断上の課題を強調しています. 組織診断と質量スペクトロメトリーは正確な識別に不可欠です.

科学分野:

心臓病科
腎臓科
病理学について

背景:

アミロイドーシスとはタンパク質が誤って折りたたまれ心臓に頻繁に影響する病気です
トランスチレチン (TTR) と軽鎖アミロイドーシス (AL) の区別は複雑である.
非典型的なプレゼンテーションは,徹底した診断評価を必要とします.

研究の目的:

TTRの心臓アミロイドーシスと腎臓限定のALカッパアミロイドーシスが共存する珍しい症例を報告する.
アミロイドーシスのサブタイプを区別する際の診断上の課題を強調する.
複雑な症例における組織診断の重要性を強調する.

主な方法:

心臓の関わりの評価のためのテクネチウムパイロフォスファートスシンチグラフィー.
心臓のアミロイドーシス診断のための内臓内臓生検
腎臓の生検と骨髄の評価腎臓と全身性アミロイドーシスの特徴
精密なタンパク質識別のための質量スペクトロメトリー

主要な成果:

画像検査でTTR心臓アミロイドーシスが疑われた患者
心臓内膜生検で TTR 心臓アミロイドーシスが確認された.
腎臓の生検と骨髄の評価は,同時に腎臓に限定されたALカッパアミロイドーシスを明らかにした.
質量スペクトロメトリーで TTRとALのアミロイドの堆積が確認されました

結論:

このケースは,特に異常な臨床的特徴を持つTTRとALアミロイドーシスを区別する診断の難しさを示しています.
非侵襲的な画像検査だけでは,正確な診断には不十分かもしれません.
マススペクトロメトリーと組み合わせた組織生検は,曖昧なアミロイドーシス症例の決定的な診断に不可欠です.

キーワード:

ALアミロイドーシス TTR アミロイドーシス併発性アミロイドーシス診断するタンパク質尿症

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