Objective To explore the value of MR] diagnosis by analyzing imaging findings of MR plain scan and enhancement scan in 6 cases of solitary fibrous tumor (SFT). Methods Retrospective analysis of 6 cases of SFT verified by operation was performed and all cases were examined via MR plain scan and enhancement scan. Lesion border, size, signal homogeneity and enhancement degree were determined and compared to surgical pathology. Results Among 6 cases of SFT, 4 cases were located in the thighs and hips, 1 case in the upper extremity and 1 case in the lower leg. Tumor were from 7 to 17 cm in diameter, less than 10 cm in 2 cases,more than 10 cm in 4 cases, average diameter was 12. 5 cm. Tumor body was round or ellipse in 2 cases, with smooth and clear border and even signal, and irregular in 4 cases with irregular necrosis and cystic lesion and uneven signal intensity. Lesions showed cquisignal intensity on T1WI and slightly high signal intensity mixed with low signal intensity on T2 WI and high signal intensity on fat-suppression T2WI and uneven enhancement. Conclusion SFT has a characteristic MRI findings. It displays slightly high signal intensity mingled with lower signal intensity regions and even signal intensity on T1 WI with clear border and even enhancement in benign tumor, whereas unclear lesion border and uneven signal intensity and enhancement reveals a malignant tumor.%目的 分析6例孤立性纤维性肿瘤(solitary fibrous tumor,SFT)MR平扫和增强的影像学表现,探讨MRI对其诊断价值.方法 回顾性分析6例经手术病理证实的孤立性纤维性肿瘤病例,均经MR平扫及增强扫描检查.确定病灶境界、大小、信号均匀度和强化程度等,并与手术病理进行对照.结果 6例孤立性纤维性肿瘤病例中,位于大腿及臀部4例,上臂1例,小腿1例.肿瘤直径7～17 cm,＜10 cm 2例,＞10 cm 4例,平均12.5 cm.2例瘤体呈圆形或椭圆形,边缘光滑、清楚,信号较均匀.4例肿瘤形态不规则,信号不均匀,其内见不规则坏死囊变区.MR T1WI呈等信号,T2WI为略高信号,其内见低信号,T2WI脂肪抑制为高信号,且不均匀强化.结论 SFT具有一定特征性MRI影像表现,T2WI多表现为略高信号中夹杂片状低信号区,良性肿瘤T1WI信号相对均匀,境界清楚,均匀强化;恶性肿瘤境界不清,信号常不均匀,且不均匀强化.
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