Mamata H, Matsumae M, Yanagimachi N, Matsuyama S, Takamiya Y, Tsugane R
Department of Radiology I, Tokai University School of Medicine, Kanagawa, Japan.
Eur Radiol. 1998;8(9):1594-7. doi: 10.1007/s003300050593.
We report a case of parasellar dermoid tumor with intra-tumoral hemorrhage. It is rare for a dermoid tumor that hemorrhage was detected as high attenuation on the initial CT. In the present case, the tumor content included a little fat component and mostly cholesterin-rich fluid which resulted in extremely low signal intensity on T2-weighted and high signal on T1-weighted MR images. In addition to this, hemosiderin accumulation in the tumor could be the reason for low signal intensity on T2-weighted images.
我们报告一例伴有瘤内出血的鞍旁皮样囊肿。皮样囊肿在初次CT检查时出血表现为高密度影较为罕见。在本病例中，肿瘤内容物包含少量脂肪成分及大部分富含胆固醇的液体，这导致其在T2加权磁共振图像上呈极低信号强度，在T1加权磁共振图像上呈高信号。除此之外，肿瘤内的含铁血黄素沉积可能是T2加权图像上低信号强度的原因。
