侵袭性纤维瘤病的MRI诊断

目的 分析侵袭性纤维瘤病(AF)的MRI特点,提高对该病的认识和诊断水平.方法 回顾性分析66例经手术病理证实的AF( 19例原发,47例复发)的临床资料和MRI表现,并与术后病理进行对照.结果 66例患者中位年龄31岁,男女比例1∶3.4.共检出肿瘤80个.浅表纤维瘤病5个；深部纤维瘤病75个,其中发生于腹内2个,腹壁6个,腹壁外67个.肿瘤长径平均大小为(8.7±5.4)cm,浅表肿瘤长径为(5.7±2.8)cm,深部肿瘤长径为(8.9±5.5)cm.98.8％( 79/80)表现为肌肉内占位病变；58.8％ (47/80)肿瘤呈卵圆形或分叶状,27.5％(22/80)呈不规则浸润状；60％(48/80)病灶边界清晰,其中4个可见假包膜.大部分肿瘤与肌肉相比在T1WI呈等、稍高或稍低信号,T2WI呈不均匀高信号,增强后可见明显不均匀强化.所有患者均未见囊变坏死和瘤周水肿.2个肿瘤见邻近骨质破坏.结论 侵袭性纤维瘤病在MRI上具有一定特征性,MRI对该病的诊断、肿瘤侵犯范围及其与周围结构关系的评估有重要价值.

MRI diagnosis of aggressive fibromatosis

Objective To analyze the MRI features of aggressive fibromatosis (AF) in order to improve its diagnostic accuracy.Method The clinical files and MRI appearances of 66 AF patients (primary 19 cases,recurrent 47 cases) were reviewed and compared with the postoperative pathological findings.Results The median age of all patients was 31 years( range,11—60 years) with a male-to-female sex ratio of 1 ∶ 3.4.Eighty tumors were discovered.There were 5 superficial fibromatosis and 75 deep fibromatosis in which 2 lesions were intraabdominal,6 lesions in the abdominal wall and 67 lesions extraabdominal.The average long diameter of all lesions was ( 8.7 ± 5.4 ) cm,of superficial lesions ( 5.7 ±2.8) cm,of deep lesions ( 8.9 ± 5.5 ) cm.Of the 80 tumors,79 were displayed as space-occupying intramuscular lesions; 47(58.8％ ) were ovoid or lobulated and 22( 27.5％ ) were infiltrative in shape; 48 (60％) lesions had a well-defined margin,of which 4 formed a pseudocapsule as they enlarged by compressing normal tissue.To compare with the muscle signal intensity on MRI,75 lesions demonstrated isointensity,mild hyperintensity or hypointensity on T1 WI,heterogeneous high intensity on T2 WI,and avid heterogeneous enhancement after contrast administration.There was no necrosis or surrounding edema in all lesions.Tumors destroyed bone in 2 cases.Conclusion Aggressive fibromatosis has characteristic features on MRI,and MRI is valuable in diagnosising AF and evaluating the extend of lesion and involvement of adjacent structures.