Imaging manifestations of CT,MRI,and PET/CT of rhabdomyosarcoma

PU Di; LIU Huijun; CHEN Yueqin; YU Hao

Abstract：Objective To investigate the imaging manifestations of CT,MRI and 18F-FDG PET/CT of rhabdomyosarcoma(RMS).Methods Totally,16 patients with RMS were collected,and their CT,MRI and 18F-FDG PET/CT manifestations were retrospectively analyzed.Results One lesion was located in the lung,10 in the head and neck,4 in the extremities,while,one in the abdominpelvic cavity.Six cases were embryonic RMS,seven were acinar RMS,two were pleomorphic RMS,and one was sclerotic RMS.Seven cases underwent CT examination,six cases showed isodense irregular soft tissue masses,and one case showed uneven slightly low density mass.After enhancement,the lesion was heterogeneously enhanced,and tortuous small vessel shadow was seen in the arterial phase lesion.Ten cases underwent MRI,of which all 10 cases showed low signal in T1WI.All 10 cases showed high signal in T2WI,with slightly low signal visible in the center of the lesion.8 cases showed diffu-sion restriction and inhomogeneous high signal in DWI and 8 cases showed inhomogeneous and obvious enhancement in en-hanced MRI,with strips of non-enhancing areas visible in the lesion.Five cases underwent 18F-FDG PET/CT and all lesions showed increased 18F-FDG uptake.Six cases showed bone destruction,one case showed pulmonary metastasis,two cases showed bone marrow infiltration,and one case invaded the right orbit and right frontal area.Conclusions CT can observe the destruc-tion of adjacent bone by RMS,MRI can clearly show the general invasive range of RMS lesions,18F-FDG PET/CT can visualize the metabolic activity of lesions and whether they are accompanied by distant metastases,thus suggesting the diagnosis of RMS.