Incidental Pancreatic Cyst
Walk the decision tree step by step, see it as a flowchart, or view the whole algorithm at once.
ACR IFC 2017·reviewed 2026-07-01
- •Applies to asymptomatic, incidentally detected pancreatic cysts presumed mucinous (branch-duct IPMN / MCN) after benign lesions (pseudocyst, serous cystadenoma, and simple cysts) are excluded clinically and by imaging.
- •Worrisome features (any one → gastroenterology/surgical referral, usually with EUS ± FNA): a solid enhancing component or mural nodule, main pancreatic duct dilation ≥7 mm (high-risk 'main-duct' feature; the white paper also flags MPD involvement/abrupt caliber change), thickened/enhancing cyst wall, associated lymphadenopathy, or a cyst ≥2.5–3 cm growing rapidly.
- •Age matters for how long to survey: the white paper notes surveillance may reasonably be curtailed in patients whose age or comorbidity would preclude surgery — a useful split around ~65 years (older patients often surveilled less aggressively/for shorter duration, individualized to surgical candidacy). It does NOT lower the imaging thresholds themselves.
- •Intervals below are the ACR IFC 2017 recommendations for a presumed branch-duct IPMN without worrisome features; MRI/MRCP is generally preferred over CT for surveillance. Growth or new worrisome features at any interval shifts the patient to referral.
- •Multiple cysts are managed by the largest cyst. New symptoms attributable to the cyst also warrant referral.
- •Currency: international IPMN guidance was updated after this ACR 2017 paper (Kyoto guidelines 2024) — this tree encodes the ACR IFC surveillance framework; a clinician managing a known IPMN should use the dedicated Kyoto/Fukuoka guidelines for worrisome-feature and high-risk-stigmata definitions.
Are any worrisome / high-risk features present?
Enhancing solid component or mural nodule; main pancreatic duct ≥7 mm or abrupt caliber change; thick/enhancing wall; lymphadenopathy; or rapid growth.
Tip: press 1–2 to choose, Backspace to go back.
Sources
- Megibow AJ, et al. Management of Incidental Pancreatic Cysts: A White Paper of the ACR Incidental Findings Committee. J Am Coll Radiol. 2017;14(7):911-923.
Educational reference for clinicians — not medical advice. Verify against the primary source before acting on it; guidelines change. Final decisions rest with the interpreting physician and your institution's protocols.