Imaging of genetically-mediated pancreatitis.

OBJECTIVES: To review the imaging of patients with Genetically-Mediated Pancreatitis (GMP), identify common imaging findings in this cohort and assess phenotypical characteristics of specific genotypes.

MATERIALS AND METHODS: Retrospective review of the databases of the Irish National Surgical Centre for Pancreatic Cancer (NSCPC) and Cystic Fibrosis (CF) from November 2010 to January 2018. Retrospective imaging and chart review for the patients with positive genetics for GMP.

RESULTS: The NSCPC database contained 699 patients; the CF database included 352 patients. Of these 1051, 14 were identified as having GMP (age range: 20-65, M:F ratio of 1:1). 14 of 1051 patients from the database had positive genetics for GMP. 10 had imaging to support a diagnosis of hereditary pancreatitis or familial recurrent pancreatitis (1.3%) and 4 had imaging to support a diagnosis of CF-related pancreatitis. Imaging findings were considered in 3 categories, determined by genotype - PRSS1 hereditary pancreatitis, SPINK 1 autosomal recessive pancreatitis and those for CFTR - cystic fibrosis related pancreatitis. Imaging findings in PRSS1 hereditary pancreatitis patients included: pancreatic atrophy, calcification and main pancreatic duct (MPD) dilatation, referred to as the PRSS1 imaging triad. Patients with the SPINK1 gene mutation had less severe imaging manifestations (pancreatic atrophy 33%, MPD dilatation 33%, pancreatic calcification 33%). CFTR patients with imaging findings had pancreatic atrophy (100%).

CONCLUSION: GMP should be suspected when the features of 'chronic pancreatitis' are seen in young adults with no history of excess alcohol intake. Genetic testing, endocrinology review and long-term imaging follow-up for pancreatic carcinoma are indicated.