[摘要]目的 討論胃腸道間質瘤(GIST)的MRI的影像診斷。方法 回顧性分析本院15例經手術及病理證實的GIST MRI影像特征。結果 15例GIST中12例邊界清晰,可見不完整包膜及腫塊內不規則壞死區,直徑3~18cm。T1加權圖像上呈較低信號或等信號,T2加權圖像上呈不均勻等、高信號,增強掃描不均勻較明顯強化;3例可見腫塊內出血、壞死的MRI信號特點。結論MRI可清楚定位,對臨床診斷該病提供了有價值的依據。
[關鍵詞]胃腸道間質瘤; MRI
[中圖分類號] R735 [文獻標識碼] A [文章編號] 1673-9701(2010)01-60-02
Magnetic Resonance Imaging of Gastro-intestinal Stromal Tumor:A retrospective Analysis of of 15 Cases
LUO Guoyao
Deparment of Radiology,Dongguan Municipal Changan Hospital,Dongguan 523843,China
[Abstract] ObjectiveTo discuss magnetic resonance imaging(MRI) characteristics of gastro-intestinal stromal tumors(GISTs). MethodsA retrospective analysis was made of the data of 15 cases of GISTs confirmed by postoperation and pathology. ResultsTwelve cases of 15 showed a clear boundary,incomplete capsule and irregular tumor necrosis,their diameter ranged from 3 to 18 cm,T1-weighted images showed low or equal signal,T2-weighted images showed asymmetric,high or equal signal,and enhanced scanning significantly enhanced non- uniformity. MRI signals showed necrosis and hemorrhage in 3 cases. ConclusionMRI can clearly locate GISTs,providing a valuable basis for the clinical diagnosis of the disease.
[Key words]Gastro-intestinal stromal tumors; Magnetic resonance imaging
胃腸間質瘤(GIST)是胃腸道最常見的間質腫瘤,以往由于對GIST認識不足,常使GIST的確診和及時治療帶來困難,該病的MRI報道不多。本文回顧性的分析2005~2008年來我院收治的胃腸道間質瘤15例的MRI特點,以提高對
胃腸道間質瘤的認識及診斷準確性。
1 材料與方法
本組共收集胃腸道間質瘤病例15例,其中男9例,女6例。年齡48~72歲,平均年齡60歲。所有病例均由手術及病理證實。GIST一般僅在切除術和病理檢查后確診,MRI顯示GIST的T1加權圖像顯示為低密度信號,T2加權圖像為高密度信號。

使用美國GE型0.2T磁共振儀,常規進行肝臟橫斷掃描用自旋回波(SE)序列,一般為12~16層,層厚8mm或10mm,層距10mm或12mm。TlWI:TR500ms~TE20ms;T±WI:TR2000ms,TE80~90ms。必要時加掃矢狀面或冠狀面MRI。檢查前病人禁食6h以上,檢查時仰臥平靜呼吸,以盡量控制腹式呼吸影響。
2 結果
15例GIST中12例邊界清晰,可見不完整包膜及腫塊內不規則壞死區,直徑3~18cm。T1加權圖像上呈較低信號或等信號(圖A);T2加權圖像上呈不均勻等、高信號,增強掃描不均勻較明顯強化(圖B);3例可見腫塊內出血,壞死和出血MRI信號特點。……