2 例腹膜后孤立性纤维瘤的 CT 表现

目的：探讨腹膜后孤立性纤维瘤的CT特征。方法：回顾性分析2例经病理检查证实的腹膜后孤立性纤维瘤的CT表现，并与病理学结果作对照分析。结果：腹膜后孤立性纤维瘤的CT表现为肿块巨大，境界清楚，轻中度分叶；平扫呈等或低密度，增强扫描呈轻中度强化或明显强化；动脉期瘤内可见线状、迂曲的血管影，静脉期肿瘤持续性不均匀强化，并可见强化的包膜。病理学检查肿瘤细胞呈梭形，间质为增生的粗细不均匀的胶原纤维，肿瘤由细胞密集区和细胞疏松区组成；免疫组织化学特点为CD34和bcl-2阳性。结论：腹膜后孤立性纤维瘤的CT表现具有一定的特征性，病理形态学及免疫组织化学检查可以明确诊断。

CT imaging features for 2 cases of retroperitoneal solitary fibrous tumor

Objective: To determine the CT imaging features for retroperitoneal solitary fi brous tumor (SFT).Methods: The imaging features of CT for 2 SFT cases, confirmed by pathological examination, were retrospectively analyzed and compared with pathological results.Results: The results of CT showed that retroperitoneal SFTs were large, well-defined and consisted of solid components with different density (equal or low). In the scan of contrast enhancement, tumors were strongly enhanced, and the multiple vascular shadows were seen in the tumor at arterial phase. Th ere was progressive enhancement from the arterial to venous phase,and capsule of tumor was displayed. Histologically, the tumors were composed of spindle cells within a background of collagen stroma, and showed a wide range of growth patt erns, alternatinghypercellular (tumor cell-rich) and hypocellular (collagen-rich) areas. The diagnosis was confirmedby positive immunohistochemical staining for CD34 and bcl-2.Conclusion: The retroperitoneal SFT possesses a definite characteristic in CT imaging features,and the diagnosis can be confirmed by histopathology and immunohistochemistry.