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This case report describes a 50-year-old woman presenting with a suspected pancreatic cyst on routine imaging, which was subsequently identified as a portal vein aneurysm (PVA) mimicking a hypervascular pancreatic tumor. Multiphase contrast-enhanced CT and endoscopic ultrasonography with Doppler confirmed the diagnosis, revealing turbulent venous flow within the lesion. The PVA regressed during follow-up.
This case highlights the potential for portal vein aneurysms to mimic pancreatic masses on initial imaging, emphasizing the need for careful evaluation and consideration of vascular lesions in the differential diagnosis.
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.
