肌内黏液瘤的MRI表现及鉴别

MRI findings and differentiation of intramuscular myxoma

目的:分析肌内黏液瘤的MRI表现及其鉴别诊断。方法:选取东部战区海军医院2015年2月—2022年2月经手术病理证实的肌内黏液瘤的6例患者的资料,分析其MRI表现。结果:6例肌内黏液瘤均为单发,分别位于小腿比目鱼肌、大腿股四头肌及股三头肌、臀大肌、肩部三角肌及肱二头肌,边界清晰或较为清晰,均位于肌肉内,未跨越肌间隙生长。平扫T_(1)WI序列上与肌肉相比呈较均匀低信号,T_(2)WI序列呈高信号,4例病灶内可见长T_(1)、短T_(2)信号之线状分隔。增强扫描呈边缘及分隔不均匀渐进性强化。2例可见病灶周围有特征性的脂肪信号带及周围肌肉内的水肿信号。结论:肌内黏液瘤在临床上比较少见,但在MRI上有较高的特异性,诊断价值高。

Objective To analyze MRI findings and differential diagnosis of intramuscular myxoma.Methods The datas of 6 patients with intramuscular myxoma confirmed by surgery pathology from February 2015 to February 2022 in the Naval Hospital of the Eastern Theater were selected,and their MRI manifestations were analyzed.Results All the 6 cases of intramuscular myxoma were single,located in soleus muscle of calf,quadriceps femoris muscle and triceps femoris muscle,gluteus maximus muscle,deltoid muscle of shoulder and biceps brachii muscle respectively.Compared with muscle,plain imaging showed uniform low signal intensity on T_(1)WI and high signal intensity on T_(2)WI.Linear separation of long T_(1) and short T_(2) signals was observed in 4 cases.The enhancement scan showed uneven enhancement of edges and separations.2 cases showed characteristic fat signal band and edema signal in surrounding muscle.Conclusion Intramuscular myxoma is rare in clinic,but it has high specificity and high diagnostic value in MRI.