Imaging-Based Risk Stratification of IPMN Using a Structured Imaging Score: A Retrospective Proof-of-Concept Study

Background/Objectives: Accurate risk stratification of intraductal papillary mucinous neoplasms (IPMNs) remains clinically challenging. This study evaluates a structured imaging-based scoring approach for IPMN risk stratification, referred to as the Tübingen Dignity Score (TDS), and compares its diagnostic performance with established methods. Methods: In this retrospective study, imaging findings from patients with suspected IPMN were analyzed using MRI, CT, and ultrasound. The TDS was applied as an imaging-based scoring system. Diagnostic performance was assessed in a histopathological subset and compared with MRI-based assessment and Fukuoka criteria. Results: MRI showed high sensitivity (94.4%) but limited specificity (57.1%). Fukuoka criteria showed high sensitivity (100%) and high specificity (91.3%) in this cohort, although with a lower positive predictive value. In contrast, the TDS showed high specificity (100%) and positive predictive value, but lower sensitivity (40%), reflecting a different diagnostic profile. These findings indicate a trade-off between sensitivity and specificity across the evaluated approaches. However, the limited number of malignant cases limits the robustness and generalizability of these estimates. Conclusions: The TDS may serve as a complementary, imaging-based tool within a multimodal diagnostic framework for IPMN. Its potential value lies in supporting clinical decision-making in selected cases, particularly where established criteria yield inconclusive results. Given the limited sample size, retrospective single-center design, and exploratory nature of this study, external prospective multicenter validation is required before routine clinical application can be recommended.