成人鼻部横纹肌肉瘤的影像学表现

目的 探讨成人鼻部横纹肌肉瘤（RMS）的CT和MRI表现。资料与方法 回顾性分析15例经病理学证实的成人鼻咽、鼻腔和鼻窦RMS的CT和MRI表现。结果 成人鼻部RMS的最常见部位为鼻腔及筛窦，最常见类型是胚胎型和腺泡型。RMS在CT平扫上通常表现为密度与肌肉相近的不均质软组织肿块，在MRI T1WI上信号与肌肉相近，在T2WI上信号高于肌肉。病灶通常边界不清，强化不均匀，并广泛侵犯邻近结构。结论 成人鼻部RMS的影像表现具有一定的特征性，在鼻部肿块的鉴别时应予以考虑。

Imaging Appearance of Nasal Rhabdomyosarcoma in Adult

Objective To investigate the CT and MRI appearance of nasal rhabdomyosareoma in adult. Materials and Methods CT and MRI findings of 15 patients with pathology proved rhabdomyosareoma of nasopharynx, nasal cavity and nasal sinus in adult were retrospectively analyzed. Results The most common sites of tumors were nasal cavity and ethmoid sinus, embryonal and alveolar type were common in rhabodomyosarcomas, On CT plain scans, the lesions were usually presented as a soft tissue mass with inbomogeneous density similar to the adjacent muscles. On MRI, the masses were heterogeneous intensity similar to muscle on T1WI and were heterogeneous hyperintensity relative to muscle on T2WI. On both CT and MR images, the tumors were presented as poorly defined margins and heterogeneously moderate to obvious enhancement, and often invaded the adjacent structures. Conclusion There are some imaging appearance in rhabdomynsarcoma, which should be considered in the diagnosis and differential diagnosis of nasal masses.