儿童腹盆腔横纹肌肉瘤的CT与MR影像学分析

CT and MR imaging analysis of rhabdomyosarcoma in abdominal and pelvic cavity in children

目的:探讨儿童腹盆腔横纹肌肉瘤(RMS)的CT与MR影像学特征。方法:对经手术病理证实的10例腹盆腔RMS患儿的CT与MR影像资料进行总结分析。其中行CT平扫10例,增强扫描6例;行MR平扫3例,增强扫描3例。结果:CT平扫均见腹盆腔内较大软组织肿物,密度欠均匀,部分有坏死区,邻近组织受压推移甚至侵犯、淋巴结及远处转移;增强后病灶不均匀轻中度强化,以周边强化明显,动脉期病灶内可见较多增粗、扭曲的供血动脉影,延迟期斑片状持续性强化。MR检查T1WI序列示腹盆腔内等低混杂信号巨大肿物,T2WI序列上以稍高信号为主;增强后呈不均匀持续性强化。结论:儿童腹盆腔RMS是一种少见的间充质源性恶性肿瘤,CT与MR影像学表现能为其诊断及鉴别提供有用的信息。

Objective To explore the CT and MR imaging features of rhabdomyosarcoma （RMS） in abdominal and pelvic cavity in children. Methods The CT and MR imaging data of pathologically confirmed RMS in abdominal and pelvic cavity in 10 children were analyzed. 10 cases received CT scan, 6 cases received enhanced CT scan, 3 cases received MR scan, and 3 cases received enhanced MR scan. Results Large soft tissue mass in abdominal and pelvic cavity, density owe even, some with necrotic area, adjacent tissue were pushed or infringed were shown by CT scan. Lesions were noneven mild-to-moderate strengthening, the surround strengthened obviously by enhanced CT scan, more thick and twisted artery were founded in lesions internal in artery phase, and esions were patchy and continuous strengthening in delay phase. Huge equivalent and lower mixed signal mass were shown by MR T1WI sequence, and by T2WI sequence, a little high signal for the lord was found, and lesions were noneven and continuous strengthening by enhanced MR scan. Conclusions RMS in abdominal and pelvic cavity was a rare kind of malignant tumor from interstitial, and the CT and MR imaging can provided useful information for diagnosis and differential diagnosis for it.