Duai-phase spiral CT features of pancreatic carcinoma

Objective To investigate dual-phase helical CT features of pancreatic carcinom in pancreatic phase and portal phase.Methods Dual-phase helical CT was performed on 39 patients with pancreatic cancer with 100ml intravenous contrast material injected at a rate of 3ml/s. Pancreatic phase (pp) and portal venous phase (pvp) began at 35 seconds and 65 seconds after the start of the injection respectively. The enhancement of pancreatic cancer and CT findings were observed.Results (1)Direct sings: The pancreatic cancer appeared enlargement of pancreas and took soft tissue mass in region of pathological changes, the density of soft tissue mass showed low-density or parity density in plain scan. The tumor conducted uniform or uniform low-density lesions and the margin showed regular or irregular annular enhancement in helical CT of pancreatic phase. The density difference of tumor with normal pancreas was descent in portal phase. (2)Indirectly sings: It accompanied with enlarge of distinct degree of cholangio of inner place liver(48.7%), choledochus (61.5%) and pancreatic ducts (38.5%) and broadening of cholecystis (30.8%), the fat of peripheral pancreas was disappeared (81.2%), the great blood vessels of peripheral pancreas was ill define (51.2%) , the pancreatic body and tail were atrophy (25.6%) and showed metastatic focus.Conclusion Dual-phase helical CT could delinease pancreatic cancer and afford more information for the early diagnosis.