Diagnostic criteria for type 1 autoimmune pancreatitis

Diagnosis	Primary basis for diagnosis	Imaging evidence	Collateral evidence
Definitive type 1 AIP	Histology	Typical/indeterminate	Histologically confirmed LPSP (level 1 H)
	Imaging	Typical	Any non-D level 1/level 2
	Imaging	Indeterminate	Two or more from level 1 (+level 2 D*)
	Response to steroid	Indeterminate	Level 1 S/OOI + Rt or level 1 D + level 2 S/OOI/H + Rt
Probable type 1 AIP		Indeterminate	Level 2 S/OOI/H + Rt

AIP: autoimmune pancreatitis; LPSP: lymphoplasmacytic sclerosing pancreatitis; H: histology; S: serology; OOI: other organ involvement; Rt: response to therapy.
* Level 2 D is counted as level 1 in this setting.

From: Shimosegawa T, Chari ST, Frulloni L, et al. International consensus diagnostic criteria for autoimmune pancreatitis: guidelines of the International Association of Pancreatology. Pancreas 2011; 40:352. DOI: 10.1097/MPA.0b013e3182142fd2. Copyright © 2011. Reproduced with permission from Wolters Kluwer Health. Unauthorized reproduction of this material is prohibited.

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Diagnostic criteria for type 1 autoimmune pancreatitis