Objective To explore the value of MSCTU in ureterovesical junction diseases.Methods MSCTU data in 41 patients with different diseases in ureterovesical junction were retrospectively analyzed.All patients underwent plain and triphase contrast en-hanced CT scans.The primary imaging data were transmitted to a worksation to get the maximum intensity projection (MIP),vol-ume rendering (VR),multiplanar reconstruction (MPR)and curve plannar reconstruction (CPR)images.Results (1)CT showed congenital abnormality in 7 patients including ectopic ureteral orifice in 1,megaloureter in 1,duplication of the urter in 4 and uret-erocele in 2.(2)Urinary stone in 25 with bladder filling defect in 1 1.(3)Tumor in 9 including polyp in 1,urothelial carcinoma in 6 and prostate cancer in 2.MSCTU clearly showed the location,shape,size of the ureterovesical junction diseases and the relationship with surrounding structures.Conclusion MSCTU plays an important role in diagnosis of ureterovesical junction diseases with an ac-curate rate of 97.5%(40/41).

Objective To discuss and analyze the imaging features of extramedullary hematopoiesis (EMH).Methods Imaging data of EMH in 7 patients with 85 lesions confirmed by clinical and pathological results were retrospectively analyzed.Results CT or MRI showed thoracic paravertebral multiple tumor-like soft tissue masses in 6 patients accompanied with pleural mass in 1,with liv-er mass in 1 and spleen mass in 1,and the masses in the distal ileum and in front of the inferior vena cava in 1.Thoracic paraverte-bral and pleural masses presented isodensity on plain CT and moderate enhancement on post-contrast CT.Among the 6 liver mas-ses,CT showed uniform density in 5 and small area of necrosis in 1.The only one spleen mass also appeared inner necrosis and mul-tiple small calcifications.The mass in the ileum presented thickened bowel wall with moderate enhancement,meanwhile the mass in front of vena cava presented obvious edge enhancement.MRI in 2 patients showed the masses with low signal on T1 WI and high sig-nal on T2 WI.Conclusion EMH has certain specific imaging characteristics,which may be helpful for correct diagnosis of EMH when combined with the clinical data.