MRI findings of primary retroperitoneal leiomyosarcoma

Shanmei LIU; Yuqin DING; Xiuliang LU; Kai HOU; Liang CHEN; Jianjun ZHOU; Mengsu ZENG

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MRI findings of primary retroperitoneal leiomyosarcoma

VernacularTitle:原发性腹膜后平滑肌肉瘤的MRI表现
Author: Shanmei LIU ^{1
,

2} ; Yuqin DING ; Xiuliang LU ; Kai HOU ; Liang CHEN ; Jianjun ZHOU ; Mengsu ZENG
Author Information

1. 复旦大学附属中山医院放射科,上海 200032
2. 常州市第七人民医院放射科,江苏常州 213011
Keywords: leiomyosarcoma; retroperitoneal; magnetic resonance imaging
From: Journal of Practical Radiology 2024;40(6):936-939
CountryChina
Language:Chinese
Abstract: Objective To investigate the MRI features of primary retroperitoneal leiomyosarcoma(PRLS).Methods Thirty-three cases of pathologically confirmed PRLS were analyzed retrospectively,and their multi-parameter MRI features were analyzed qualitatively and quantitatively.Results Of the 33 PRLS,24 cases were located in the renal hilum,inferior vena cava,or the area around the bifurcation of the iliac vessels.Twenty-four cases had relatively intact capsule,25 cases had necrosis,and 15 cases had coagulated geographic necrosis.The mean diameter of the tumors was(9.9±5.1)cm,ranging from 3.0 to 20.7 cm,among which 27 cases with a diameter larger than 5 cm.The tumor parenchyma of the 33 PRLS all showed significantly high signal intensity on diffusion weighted imaging(DWI),and significantly low signal intensity on apparent diffusion coefficient(ADC)map.The tumor parenchyma showed moderate to obvious degree of progressive enhancement,and the signal intensity value of the tumor in each phase after contrast injection was higher than that of the psoas major muscle(P＜0.001).Conclusion PRLS are usually large but have a relatively intact capsule and are closely related to the major retroperitoneal veins.The coagulated geographic necrosis,significantly limited diffusion of water molecules,and progressive enhancement pattern all show certain MRI characteristics.