What does this research mean for the field?

Portal vein aneurysms can mimic pancreatic masses on imaging studies, leading to potential misdiagnosis. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To illustrate the imaging challenges of a portal vein aneurysm that mimics pancreatic masses.

February 21, 2026Open Access

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

Puntos clave

To illustrate the imaging challenges of a portal vein aneurysm that mimics pancreatic masses.
Reported a case of a woman in her 50s referred for suspected pancreatic cyst.
Used non-contrast MRI and multiphase contrast-enhanced CT for initial imaging.
Conducted endoscopic ultrasonography with Doppler to confirm findings.
Initial imaging raised suspicion for a hypervascular pancreatic tumor.
Doppler confirmed turbulent venous flow indicating a portal vein aneurysm.
The lesion regressed over the follow-up period.

Resumen

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.

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