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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: Am J Surg Pathol. 2015 Dec;39(12):1730–1741. doi: 10.1097/PAS.0000000000000533

Table 1.

Proposed Revised Terminology of PanIN, IPMN and MCN

Former terminology (based on 2004 Classification2 and 2010 WHO) Revised terminology (2015)
PanIN-1a Low-grade PanIN
PanIN-1b Low-grade PanIN
PanIN-2 Low-grade PanIN
PanIN-3 (carcinoma in-situ) High-grade PanIN
IPMN with low-grade dysplasia IPMN, low-grade
IPMN with intermediate-grade dysplasia IPMN, low-grade
IPMN with high-grade dysplasia (carcinoma in-situ) IPMN, high-grade
IPMN with an associated invasive carcinoma IPMN with an associated invasive carcinoma/invasive carcinoma with an associated IPMN (the latter may be used if the invasive component is substantial)
MCN with low-grade dysplasia MCN, low-grade
MCN with intermediate-grade dysplasia MCN, low-grade
MCN with high-grade dysplasia (carcinoma in-situ) MCN, high-grade
MCN with an associated invasive carcinoma MCN with an associated invasive carcinoma/invasive carcinoma with an associated MCN (the latter may be used if the invasive component is substantial)