Figure 1.
Schematic images of meandering main pancreatic duct (MMPD).
The thick line indicates the common bile duct, and the thin line indicates the main pancreatic duct. MMPD was classified into subtypes based on its morphology in the head of pancreas on magnetic resonance cholangiopancreatography: normal type (A), examples of loop type (B1–2), and examples of reverse-Z type (C1–3). Assuming the body-axis as x-axis and horizontal direction as y-axis, MPD curves in loop and reverse-Z types have two extrema in horizontal direction respectively (arrows), while normal type has none. Dorsal pancreatic duct could be observed or not.
Table 1.
Distribution of the causes of non-tumor-induced pancreatitis in patient group.
Table 2.
Clinical features of subjects in Community group with and without meandering main pancreatic duct (MMPD).
Table 3.
Clinical features of subjects in Idiopathic pancreatitis group with and without meandering main pancreatic duct (MMPD).
Table 4.
Clinical features of subjects in Idiopathic recurrent acute pancreatitis (IRAP) subgroup with and without meandering main pancreatic duct (MMPD).
Figure 2.
Anatomical variations of meandering main pancreatic duct as seen on magnetic resonance images.
(A) Normal type on a magnetic resonance cholangiopancreatography (MRCP) image, (B) loop type on an MRCP image, (C and D) reverse-Z type on MRCP images. The white arrow on subfigures (B, C, D) indicates an abnormally curved section of the main pancreatic duct in the head of pancreas.
Table 5.
Frequency of meandering main pancreatic duct (MMPD) and its contribution to idiopathic pancreatitis arranged by anatomical subtypes of MMPD and onset types of idiopathic pancreatitis.
Table 6.
Rate of severe pancreatitis in patients with idiopathic acute and recurrent acute pancreatitis.
Table 7.
Involved regions in idiopathic acute and recurrent acute pancreatitis.