Objective To retrospectively analyze the CT and MRI imaging characteristics and pathological features of Endolymphatic sac tumor(ELST),so as to improve the correct diagnosis rate of this rare tumor.Methods Summarized the imaging features,pathology and differential diagnosis of 7 cases of ELST in our hospital.Results ELST is a lobulated mass with abundant blood supply and expansive growth,and the lesion center is located at the middle and posterior margin of the petros of the temporal bone.Imaging features:CT showed that the tumors in all 7 cases were lobulated with insect-like destruction of the surrounding bones.The lesions were located in the middle of the posterior margin of the temporal bone rock,and"sand granular"high-density shadows were visible inside the tumors with curved sclerotic edges.MRI showed mixed high-signal images on T2WI in 3 cases,and double low-signal images with uneven thickness and strip were seen.The mixed signals of T1WI in 3 cases were mainly high and slightly high.In 1 case,the tumor showed equal signal,and T1WI high signal shadow was seen at the lesion margin.6 cases with unrestricted DWI showed low signal and slightly low signal change.The enhanced scan showed that the lesions showed uneven enhancement in 6 cases.On MRI,T1 and T2 double high signal,DWI is still high signal;The double low signal enhancement scan is obviously enhanced as its characteristic change.Pathological features:Pathological features:Parenchymal tumor cells were papillary or glandular,covered by columnar epithelium,with abundant interstitial blood vessels and local glial matrix.Immunohistochemistry showed that Vimentin and CK were positive with qualitative value.Conclusion CT,MRI combined with pathological control study,reflectes the imaging features and pathological basis of ELST,and provides imaging basis for reducing misdiagnosis rate,preoperative evaluation and prognosis evaluation.
维普
万方数据