Objective To study the imaging findings of atypical thymoma.Methods 16 patients with atypical thymomas confirmed by pathology were involved in this study.Results In 16 cases,the all tumors appeared as soft tissue masses in anterior mediastinum,other imaging findings included lobulated sign in 12,calcification with in the tumors in 9,directly invasion to adjacent fatty tissue in 13 and mediastinum pleural and anterior chest wall in 7.The ipsilateral mediastinum pleural planting in 8,vascular involvement in 7 and pleural effusion in 6,pericardium effusion in 3 were showed.The tumors with smooth margins and clear surrounding fatty tissue were seen in 3,that were really simulating the benign thymoma.Conclusion Atypical thymoma are of certain imaging characteristics.

Objective To assess the quality of coronal multi-planar reconstructed versus direct coronal scan images and to confirm whether the multiplanar reconstructed image can replace coronal scan.Methods One hundred and sixteen patients with orbital and paranasalsinuses disease were examined with GE Lightspeed plus 4 slices helical CT.All patients had transvers scan,and the coronal multiplannarreconstructed images were reformatted basis on transverse scan.All reformatted and scanned images were evaluated by the senior radiologists.Results In 116 cases,simultaneously multiplanar reconstructed images were performed in 60 cases,the quality of reformatted coronal imageswas similar to direct coronal scan in revealing normal anatomy and lesions of orbit and paranasal sinuses,all images were excellent andimaging quality was grade Ⅰ.54 cases couldn't be undergone direct coronal scan but reformatted coronal images also acquired the effect of diagnosis(32 cases were grade Ⅰ and 3 cases were grade Ⅱ on quality).Conclusion Direct coronal scan can be substitued by multiplanar reconstruction of multi-slice helical CT scan for orbit and paranasal sinuses.