CT and MRI manifestations of retroperitoneal dedifferentiated liposarcoma
10.12354/j.issn.1000-8179.2023.20231094
- VernacularTitle:腹膜后去分化脂肪肉瘤的CT和MRI表现
- Author:
Debei MA
1
;
Zhaoxiang YE
;
Ying LIU
;
Shichang LIU
;
Fangyuan QU
Author Information
1. 天津医科大学肿瘤医院放射科,国家恶性肿瘤临床医学研究中心,天津市"肿瘤防治"重点实验室,天津市恶性肿瘤临床医学研究中心(天津市 300060)
- Keywords:
retroperitoneal dedifferentiated liposarcoma;
computed tomography(CT);
magnetic resonance imaging(MRI);
imaging manifestation
- From:
Chinese Journal of Clinical Oncology
2023;50(24):1254-1258
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the computed tomography(CT)and magnetic resonance imaging(MRI)features of retroperitoneal ded-ifferentiated liposarcoma(DDL),and improve the understanding of DDL and the accuracy of preoperative diagnosis.Methods:Clinical and imaging features of 25 patients with retroperitoneal DDL from Tianjin Medical University Cancer Institute&Hospital,confirmed by patho-logy from January 2012 to June 2022,were retrospectively analyzed.Results:Among 25 cases of retroperitoneal DDL,19 and 6 had single and multiple tumors,respectively and 10 and 15 were oval and irregular shaped tumors,respectively.Most lesions had unclear boundaries,with 15 cases invading the surrounding tissues and organs.Small vessel shadows were visible in 15 cases,while calcifications or ossifications were observed in 7 cases,and cystic necrosis was observed in only 3 cases.Enhanced scanning exhibits a centripetal and progressive con-tinuous augmentation characteristic defined as"slow in and slow out."According to its manifestations in CT and MRI,it can be divided into two types:type I(soft tissue mass type),where the tumor has a soft tissue component with no fat content(14 cases);and type Ⅱ(fat con-taining),where the tumors exhibit both soft tissue and adipose components,most of which are clearly defined and rarely present in a mosa-ic shape.In abnormal fat areas,cord-like fibrous septa can be seen.Among them,the intratumoral fat composition<50%was Ⅱa type(10 cases).Intratumor fat composition≥50%was type Ⅱb(1 case).Conclusions:Combined with imaging classification,a comprehensive ana-lysis of the CT and MRI imaging characteristics of retroperitoneal DDL is of great value for its preoperative qualitative diagnosis.
