Liang Zhu1, Hua-Dan Xue1, Wen Zhang2, Qiang Wang3, Bei Tan3, Ya-Min Lai3, Wei-Yang Zheng3, Patrick Asbach4, Bernd Hamm4, Timm Denecke5, Zheng-Yu Jin6. 1. Department of Radiology, Peking Union Medical College Hospital, Beijing, China. 2. Department of Rheumatology, Peking Union Medical College Hospital, Beijing, China. 3. Department of Gastroenterology, Peking Union Medical College Hospital, Beijing, China. 4. Department of Radiology, Charité - Universitaetsmedizin Berlin, Corporate Member of Freie Universitaet Berlin, Humboldt-Universitaet zu Berlin, Berlin Institute of Health, Charitéplatz 1, Berlin, Germany. 5. Department of Diagnostic and Interventional Radiology, University of Leipzig Medical Center, Leipzig, Germany. 6. Department of Radiology, Peking Union Medical College Hospital, Beijing, China. Electronic address: jin_zhengyu@163.com.
Abstract
PURPOSE: To evaluate the imaging pattern of pancreaticobiliary lesions in patients with treated type 1AIP, to determine the incidence of disease relapse and malignancy, and to identify the risk factors. METHOD: The institutional review board approval was acquired. All patients gave written informed consent. From a prospective clinico-radiological database since 2012, consecutive patients with type 1 AIP who were treated and followed up (≥18 months) were identified. The presence/absence of pancreaticobiliary lesion(s) development during follow-up were assessed. The etiology was determined and the imaging pattern was compared to the initial attack. Risk factors were identified by univariate and multivariate analysis. RESULTS: Among 103 patients with treated type 1 AIP, 44 (42.7%) developed pancreaticobiliary lesions during follow up (median time interval to initial diagnosis: 17 months, range 3-62 months), mostly after steroid discontinuation (63.6%) or during maintenance therapy (29.5%). All lesions were disease relapse, which responded to steroid treatment. At relapse, pancreatic involvement was less frequent (81.8% vs 100%, p = 0.003), and the pancreas size was smaller (p < 0.01), whereas extra-pancreatic bile duct (ExPanBD) involvement was more severe and extensive (both p < 0.01). Multivariate analysis revealed ExPanBD involvement at initial diagnosis (hazard ratio 2.437, 95% CI 1.343-7.402, p = 0.002) and serum IgG4 response ratio at the induction phase (hazard ratio 0.357, 95% CI 0.055-0.804, p = 0.011) as significant independent predictors of relapse. CONCLUSIONS: In treated type 1 AIP, although imaging pattern may differ, pancreaticobiliary lesions are usually manifestations of disease relapse. ExPanBD involvement and poor serum response suggests high risk of relapse.
PURPOSE: To evaluate the imaging pattern of pancreaticobiliary lesions in patients with treated type 1AIP, to determine the incidence of disease relapse and malignancy, and to identify the risk factors. METHOD: The institutional review board approval was acquired. All patients gave written informed consent. From a prospective clinico-radiological database since 2012, consecutive patients with type 1 AIP who were treated and followed up (≥18 months) were identified. The presence/absence of pancreaticobiliary lesion(s) development during follow-up were assessed. The etiology was determined and the imaging pattern was compared to the initial attack. Risk factors were identified by univariate and multivariate analysis. RESULTS: Among 103 patients with treated type 1 AIP, 44 (42.7%) developed pancreaticobiliary lesions during follow up (median time interval to initial diagnosis: 17 months, range 3-62 months), mostly after steroid discontinuation (63.6%) or during maintenance therapy (29.5%). All lesions were disease relapse, which responded to steroid treatment. At relapse, pancreatic involvement was less frequent (81.8% vs 100%, p = 0.003), and the pancreas size was smaller (p < 0.01), whereas extra-pancreatic bile duct (ExPanBD) involvement was more severe and extensive (both p < 0.01). Multivariate analysis revealed ExPanBD involvement at initial diagnosis (hazard ratio 2.437, 95% CI 1.343-7.402, p = 0.002) and serum IgG4 response ratio at the induction phase (hazard ratio 0.357, 95% CI 0.055-0.804, p = 0.011) as significant independent predictors of relapse. CONCLUSIONS: In treated type 1 AIP, although imaging pattern may differ, pancreaticobiliary lesions are usually manifestations of disease relapse. ExPanBD involvement and poor serum response suggests high risk of relapse.