Objective To explore the value of CT and MRI in the diagnosis of low-grade malignant myofibroblast sarco-ma(LGMS)in order to improve the understanding of this disease.Methods the data of 10 patients with LGMS con-firmed by CT and/or MRI,including 2 female and 8 male,aged 33-81 years(mean 60.2 years),were retrospectively an-alyzed;Among them,3 cases underwent CT plain scan and enhanced examination,3 cases underwent MR plain scan and enhanced examination,and 4 cases underwent CT and MRI plain scan and enhanced examination at the same time.The ima-ging manifestations and characteristics of LGMS were analyzed.Results 1 case was located in the tongue,3 cases in the limbs,2 cases in the abdominal wall,l case in the waist and buttocks,1 case in the chest wall and 2 cases in the abdominal cavity;The maximum diameter of the lesion was 52-277 mm,and the average diameter was about 79.6 mm;Compared with muscle density in 7 cases of CT plain scan,1 case showed low density,1 case showed isodensity,5 cases showed isolow mixed density,mainly isodensity;In contrast-enhanced CT scan,2 cases had mild to moderate enhancement and 5 cases had obvious uneven enhancement.Compared with the muscle signal of the same layer,the signal of 7 cases on MRI plain scan was low on T1WI,of which 4 cases showed"island like"and"soft egg like"high signal,and T2WI showed mixed signal.The focus center was mainly high signal,and the focus on enhanced scan was obviously non-uniform enhancement,showing flower ring changes.Conclusion LGMS lesions are large in size,and most of the density or signal are non-uniform.Large low-density shadows or short T,and long T2 signal shadows can be seen in the center of the lesions,showed"island like"and"soft egg like"high signal.Most of the enhanced lesions have obvious non-uniform enhancement around the periphery,showing ring enhancement.It is of great value for the diagnosis of LGMS.
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