Involved regions in idiopathic acute and recurrent acute pancreatitis.

<p>MMPD, meandering main pancreatic duct.</p

Clinical features of subjects in Idiopathic pancreatitis group with and without meandering main pancreatic duct (MMPD).

a<p>,Significant after family-wise correction;</p>b<p>,Student's t-test;</p>c<p>,Fisher's exact test; P₁, P-value for the test between idiopathic pancreatitis patients with and without MMPD; P₂, P-value for intergroup test between Community group (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0037652#pone-0037652-t002" target="_blank">Table 2</a>) and Idiopathic pancreatitis group; SD, standard deviation.</p

Clinical features of subjects in Idiopathic recurrent acute pancreatitis (IRAP) subgroup with and without meandering main pancreatic duct (MMPD).

a<p>,Significant after family-wise correction;</p>b<p>,Student's t-test;</p>c<p>,Fisher's exact test; P₁, P-value for the test between IRAP subjects with and without MMPD; P₂, P-value for intergroup test between Community group (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0037652#pone-0037652-t002" target="_blank">Table 2</a>) and IRAP subgroup; SD, standard deviation.</p

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.

a<p>, significant;</p>b<p>,numbers in square brackets represent percentages;</p>c<p>,Fisher's exact test;</p>d<p>,numbers in square brackets represent the 95% confidence interval; OR, odds ratio.</p

Rate of severe pancreatitis in patients with idiopathic acute and recurrent acute pancreatitis.

<p>CECT, contrast enhanced computed tomography; JPN, Japan; MMPD, meandering main pancreatic duct; NECT, non-enhanced computed tomography.</p

Clinical features of subjects in Community group with and without meandering main pancreatic duct (MMPD).

a<p>,Significant after family-wise correction;</p>b<p>,Student's t-test;</p>c<p>,Fisher's exact test; P, P-value for the test between Community group subjects with and without MMPD; SD, standard deviation.</p

Schematic images of meandering main pancreatic duct (MMPD).

<p>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.</p

Anatomical variations of meandering main pancreatic duct as seen on magnetic resonance images.

<p>(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.</p