Differential diagnostic value of CT in the mass-type chronic pancreatitis in the head of the pancreas and carcinoma of head of pancreas

Objective:To analyze CT characteristics of pancreatic carcinoma and chronic pancteatitis with mass in the head of the pancreas in order to improve its CT differential diagnostic accuracy.Materials and Methods:The clinical data of 30 cases with mass-type chronic pancreatitis in the head of the pancreas and carcinoma of head of pancreas were retrospec-tively analyzed.Results:The main CT differential points of the mass-type chronic pancreatitis and carcinoma of head of pan-creas could be summarized as follows:①calcification within the mass(17 cases,0 case);②contrast:lesions were raltive low density in portal venous phase(2 cases,30 cases),and raltive equal density(28 cases,0 case);③shrink of the tail of pancreas(0 case,18 cases),pancreatic pseudocyst(13 cases,1 case);④dilatation of the pancreatic duct(18 cases,25 cases),string of beads of dilation of pancreatic duct(15 cases,4 cases),smooth dilation(3 cases,21 cases),dilated pancreatic duct interrupt in the lesion area(4 cases,12 cases),dilated pancreatic duct passed through the lesion area(14 cases,1 case);⑤dilatation of bile duct(25 cases,12 cases),interrupt in the lesion area(2 cases,21 cases),tapering from above downward(10 cases,4 cases);⑥ no cross sign(0 case,20 cases).Conclusion:The CT findings of the pancreatic head mass in chronic pancreatitis is charac-teristic,CT plays an important role in the of diagnosis and differential diagnosis of the two diseases.