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目的探讨低度恶性肌纤维母细胞肉瘤(LGMS)的影像学表现并分析误诊原因。方法回顾性分析9例经病理证实的LGMS患者的临床和影像学资料;8例行CT检查,其中5例行CT平扫加增强检查;4例行MR检查,其中1例行平扫加增强检查。结果 9例LGMS中,表现为圆形或类圆形软组织肿块5例,病灶形态不规则4例,向周围组织侵犯4例。CT平扫表现为软组织密度影,4例增强后可见大小不等的囊变、坏死区,1例强化均匀;MR平扫T1WI呈等低信号,T2WI呈等、稍高信号,增强呈不均匀强化;1例内见点状钙化及出血。8例术前误诊为其他肿瘤。结论 LGMS临床罕见,其影像学表现缺乏特征性,确诊仍有赖于组织病理学和免疫组织化学检查。
Objective To investigate the imaging findings of low grade myofibroblastic sarcoma (LGMS) and analyze the causes of misdiagnosis. Methods The clinical and imaging data of 9 LGMS patients confirmed by pathology were retrospectively analyzed. CT was performed in 8 patients undergoing CT scan, 5 patients underwent CT scan and enhanced MRI, and 4 patients underwent MR scan. Among them, 1 patient underwent scan and contrast enhancement an examination. Results In 9 LGMS cases, 5 cases showed round or oval soft tissue mass, 4 cases were irregular in shape and 4 cases were infiltrated to surrounding tissues. CT scan showed soft tissue density, 4 cases showed enhanced cystic and necrotic areas of varying sizes, 1 case of enhanced uniform; MR plain T1WI was low signal, T2WI was equal, slightly higher signal, the increase was uneven Strengthen; see a case of punctate calcification and bleeding. 8 cases misdiagnosed as other tumors before surgery. Conclusions LGMS is rare in clinical practice, and its imaging features are lacking. Diagnosis is still dependent on histopathology and immunohistochemistry.