甲状腺結節のデュアルプレーン・縦長横長定義:TIRADS間での比較分析
Yu Zhuang1, Jiamin Chen2, Jing Zhong1
1Department of Ultrasound, The Fifth Affiliated Hospital Sun Yat-Sen University, Zhuhai, China.
European radiology
|February 28, 2026
まとめ
デュアルプレーン縦長横長(TTW)超音波基準は、甲状腺結節の悪性度診断と穿刺吸引(FNA)ガイダンスにおいて優れた精度を提供します。この所見は、中国(C)-TIRADSおよび欧州(EU)-TIRADSフレームワークにおいて特に重要であり、リスク層別化を改善します。
科学分野:
- 放射線学
- 腫瘍学
- 医用画像
背景:
- 超音波(US)を用いた甲状腺結節の評価では、縦長横長(TTW)形状の評価が含まれることが多いですが、この評価に最適なUSプレーンについては議論が続いています。
- 異なる甲状腺画像報告およびデータシステム(TIRADS)が存在し、それぞれ結節分類に特有の基準があります。
研究 の 目的:
- 甲状腺結節の悪性度予測における様々なTTW超音波基準の診断パフォーマンスを比較すること。
- 4つの主要なTIRADS分類(中国、アメリカ、ヨーロッパ、韓国)における最適なTTW基準を特定すること。
- TTW基準の穿刺吸引(FNA)生検決定のガイダンスにおける有用性を評価すること。
主な方法:
- 1125個の甲状腺結節の前処置US画像の後ろ向きレビュー。
- 4つのTTW基準を定義しました:横断プレーンのみ(T-only)、縦断プレーンのみ(L-only)、両プレーン(Dual-plane)、およびいずれか一方または両方のプレーン(Single- or dual-plane)。
- 悪性度予測およびFNAガイダンスのための受信者操作特性曲線下面積(AUC)および正味再分類改善(NRI)を使用して診断パフォーマンスを評価しました。
主要な成果:
- 単一またはデュアルプレーン基準は、TTWを単独で使用した場合、悪性度に対して最も高いAUC(0.813)を示しました。
- TIRADS内では、デュアルプレーン基準は中国(C)-TIRADS(0.884)および欧州(EU)-TIRADS(0.874)で最も高いAUCを達成しました。
- デュアルプレーンは、C-TIRADSおよび米国放射線腫瘍学会(ACR)-TIRADSにおいて、悪性度の再分類およびFNAガイダンスの改善も示しました。
結論:
- 最適なTTW超音波プレーンの選択は、他の疑わしいUS所見と併用するかどうかによって異なります。
- 両方の横断および縦断プレーン(デュアルプレーン)でTTW形状を評価することは、TIRADS内での悪性度診断およびFNA決定において優れた精度を提供します。
- これらの所見は、甲状腺結節評価ガイドラインの改善および生検推奨の標準化に貴重な証拠を提供します。
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