原发性腹膜后脂肪肉瘤CT表现与病理对照分析

CT features of primary retroperitoneal liposarcoma correlated with pathology

目的：探讨原发性腹膜后脂肪肉瘤（PRI。）的CT表现及与病理组织学的关系。方法：搜集经术后病理证实的12例PRI。，回顾性分析其CT表现及与病理类型的关系。结果：肿瘤最大径为8～27cm，1例圆细胞型及1例多形性型呈椭圆形，其余10例均呈显著不规则分叶状或铸型生长。CT平扫表现：8例可见脂肪组织，分别为分化型3例、去分化型2例、混合型3例；4例未见明显脂肪组织，其中2例黏液型以液性密度为主，1例圆细胞型及1例多形性型v；t软组织密度为主；2例混合型肿块内伴有大块致密钙化。CT增强扫描表现：8例行增强扫描，其中2例脂肪瘤型可见软组织密度结节及条索影轻度强化；1例硬化型软组织团块呈轻度强化；2例黏液型可见索条分隔样轻度强化及整体云絮样轻度强化；1例去分化型中的去分化瘤体区域、1例多形性型及l例伴有钙化的混合型中的多形性瘤体区域均可见明显不均匀强化。结论：PRI。病理组织学的多样性决定了其CT表现的多样性，不同亚型CT表现具有各自特点，并能反映各自病理类型的特征。

Objective： To study CT features and pathologic types of primary retroperitoneal liposarcoma （PRI.）. Methods：All the 12 cases of PRL were performed CT scanning and proved by pathology. The CT features and pathologic types were analyzed retrospectively. Results：The diameters of tumors ranged from 8~27cm. Except for one round cell PRI. and one pleomorphic PRI. were oval shaped,the shape of other 10 cases were irregular. Fat tissue was observed in well dif ferentiated （n 3） ,mixed （n--3） and dedifferentiated （n--2） primary retroperitoneal liposarcoma. Myxoid PRI. （n 2） was mainly composed by liquid density on CT,while calcification could be found in 2 cases of mixed type PRI.. Eight of 12 cases were performed CT enhancement. Five of them （2 lipoma PRLs,one sclerosing PRI.,and 2 myxoid PRLs） enhanced slightly,other 3 tumors （one dedifferentiated,one pleomorphic and one mixed type PRI.） enhanced intensively and heteroge neously. Conclusion：Different types of PRL showed different imaging features on CT images. CT features of different sub types have some characteristics and can reflect the different pathologic subtypes of PRI..