| Objective: To study the MRI features of perirenal space involvement in acute pancreatitis and its correlation with the severity of pancreatitis.Methods: 119 patients with acute pancreatitis confirmed by clinical and laboratory were recruited in this study. All of them had MR imaging on 1.5T MR scanner within 96 hours after the first onset of symptoms. The severity of acute pancreatitis on MR imaging was graded by MR severity index (MRSI). Acute pancreatitis was graded as mild (0–2 points), moderate (3–6 points) and severe (7–10) points of MRSI. The perirenal space involvement on MR imaging was graded as none (0 point), mild (1 point) and severe (2 points). The relationship between perirenal space involvement and the severity of pancreatitis was analyzed.Results: In the 119 patients with acute pancreatitis, 40.34%, 49.58% and 10.08% of patients had mild, moderate and severe acute pancreatitis according to MRSI, respectively. 73.95% of patients (88/119) had perirenal space involvement on MR imaging, which showed streak and patchy hypointensity on T1 weighted images and hyperintensity on T2 weighted images, respectively. The perirenal space involvement was graded as mild in 41.67% (20/48) of patients with mild, 19.72 %( 14/71) with moderate and severe acute pancreatitis (χ2=7.249, p=0.007). And the perirenal space involvement was graded as severe in 42.06% of patients with mild and moderate, but in 75.00% of patients with severe acute pancreatitis (χ2=4.724, p=0.030). The grading of perirenal space involvement on MR imaging was related to MRSI (r=0.714, p=0.000). The coefficient correlation between The grading of perirenal space involvement on MR imaging and APACHE-Ⅱscores was weak(r=0.195, p=0.034).Conclusion: The prevalence of perirenal space involvement in acute pancreatitis is higher on MR imaging than that on CT previous reported. We found the perirenal space involvement on MR imaging was correlated with the severity of acute pancreatitis.
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