Diagnostic Value of Multi-slice CT in the Mass Type Chronic Pancreatitis of Pancreatic Head

Objective:To investigate the multi-slice CT (MSCT) manifestations of the mass type chronic pancreatitis in the pancreatic head.Methods:The clinical materials as well as the MSCT manifestations of 30 cases with mass type chronic pancreatitis in the pancreatic head proved by surgery,fine needle aspiration cytology and CT follow up were retrospectively analyzed.Results:The main MSCT manifestations of the mass type chronic pancreatitis of pancreatic head could be summarized as follows:①a mass in the pancreatic head area including simple pancreatic head enlargement (7 cases),a mass accompanied with pseudocyst (6 cases),calcification within the mass (14 cases),both calcification and pseudocyst within the mass (3 cases) were assessed on plain CT.Contrast administration were performed in 20 cases.Of which,there were gradual enhancement of the lesions (15 cases),significant enhancement of the lesion during arterial phase and then iso-attenuation as the normal pancreatic area during portal venous phase (3 cases),no significant enhancement (2 cases).②Dilatation of the pancreatic duct were presented in 18 cases including beaded dilatation (15 cases),dilated pancreatic duct passed through the mass lesion (10 cases),calcification of pancreatic duct (13 cases).③Dilatation of common bile duct were shown in 12 cases including tapering from above downward (10 cases).④Obscuring of the peripancreatic blood vessels were revealed in 23 cases,no embedding and invading of blood vessels were shown.⑤Anterior renal fasciae thickening were shown in 15 cases.Conclusion: Certain MSCT characteristics of the mass type chronic pancreatitis in the pancreatic head could be assessed,which provided important clinical value in the diagnosis and differential diagnosis of this disease entity.