Portal vein aneurysm mimicking a pancreatic mass: A case report with an emphasis on imaging pitfalls.

Nanami Okamoto, Ken Ishii, Mikinori Kataoka, Akira Kunimatsu

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Article in Radiology case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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4 authors.

Nanami OkamotoDepartment of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3, Mita, Minato-ku, Tokyo 108-8329, Japan.

Ken IshiiDepartment of Gastroenterology, International University of Health and Welfare Mita Hospital, 1-4-3, Mita, Minato-ku, Tokyo 108-8329, Japan.

Mikinori KataokaDepartment of Gastroenterology, International University of Health and Welfare Mita Hospital, 1-4-3, Mita, Minato-ku, Tokyo 108-8329, Japan.

Akira KunimatsuDepartment of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3, Mita, Minato-ku, Tokyo 108-8329, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Portal vein aneurysm (PVA) is a rare vascular abnormality that may mimic pancreatic or peri-pancreatic masses. We report a case of a woman in her 50s who was referred to our hospital after an annual routine medical check-up revealed a suspected pancreatic cyst. Initial non-contrast MRI and multiphase contrast-enhanced CT demonstrated a round enhancing lesion adjacent to the portal venous confluence, raising suspicion for a hypervascular pancreatic tumor. Subsequent endoscopic ultrasonography with Doppler confirmed turbulent venous flow within the lesion, consistent with a portal vein aneurysm. The lesion gradually regressed during follow-up. This case highlights the importance of including vascular lesions in the differential diagnosis of pancreatic masses and demonstrates the diagnostic role of Doppler-enhanced ultrasonography and multiphase CT.

Indexed as

Case reportContrast-enhanced ultrasonographyEndoscopic ultrasonographyPancreatic massPortal vein aneurysm

Identifiers

PMID41756552

DOI10.1016/j.radcr.2026.01.085

PMCPMC12933561

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