【臨床症状】30代 子宮底部に3cmの腫瘤影
【問題】画像所見と診断名は?
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➡ 造影MRI
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▶答えはこちら
- T2WIにおいて子宮筋層にびまん性に高信号と腫大を認める
- その内一部は、T1-FSでも高信号を呈し、点状出血があると考えらえる
- またjunctional zoneの不明瞭化も認め、上記より子宮腺筋症が第一に疑われる
- また造影画像では濃染を認めない
- その他の所見として、少量の腹水と子宮前壁に最大4cm程度の子宮筋腫あり
【子宮腺筋症】
・子宮腺筋症は子宮内膜組織が子宮筋層内へ侵入し、異所性に増殖/線維化している状態
・びまん性と限局性の2パターンがある
・経産婦に多いとされ、月経過多や不正出血、月経困難症によって発見される事が多い
・臨床的に子宮筋腫との鑑別が問題になるが、子宮筋腫との大きな違いは、病変の境界が明瞭であるかどうかが大きな判断材料になる
・T2WIで低信号で、境界明瞭であれば子宮筋腫、T2WIで低信号(一部点状高信号)で境界が不明瞭なら子宮腺筋症
・またjunctional zoneが不明瞭化する事も多い
・T1WIにて点状の高信号を認める事があるが、これは出血を反映している
・なぜ子宮筋腫との鑑別が重要かと言うと、子宮筋腫は外科的に部分摘出可能だが、子宮腺筋症はびまん性に浸潤するため全摘するしかないため
参考書籍:婦人科MRIアトラス 改定第2版
ジェネラリストを目指す人のための画像診断パワフルガイド 第2版