Splenic vein aneurysm (SVA) is an extremely rare vascular abnormality. Although endoscopic
ultrasound (EUS) can detect vascular structures, the characteristic findings of an
SVA have not been reported. We describe a patient with an SVA found incidentally on
an EUS that was performed for gastric antral ectopic pancreas. The diagnosis was based
on the findings during EUS using an electronic radial scanning echoendoscope (EG-530UR;
Fujifilm Corp., Saitama, Japan) with color Doppler flow-mapping capabilities.
We identified a focally dilated distal splenic vein at the level of the pancreatic
tail ([Fig. 1 a, b]), and a venous flow signal was detected by pulsed-wave Doppler ultrasound ([Fig. 1c]). Based on these findings, we diagnosed an SVA. Subsequent venous-phase three-dimensional
computed tomography angiography (CTA) revealed a venous aneurysm on the splenic vein,
confirming the final diagnosis of SVA ([Fig. 2]).
Fig. 1 Endoscopic ultrasound (EUS) images of a splenic vein aneurysm using: a B-mode, which shows a localized dilatation of the splenic vein (large arrow) and
the intact part of the splenic vein (small arrow); b color Doppler, which shows the blood flow in the lesion; c pulsed-wave Doppler, which shows continuous venous flow.
Fig. 2 Three-dimensional computed tomography angiography showing an aneurysm (17 mm in diameter)
at the hilum of the splenic vein.
A splenic artery aneurysm (SAA) is similar to an SVA in form and shape, and must be
distinguished from an SVA. We previously reported the characteristic EUS findings
of SAAs [1]. EUS using pulsed-wave Doppler mode shows a pulsating arterial wave in an SAA. In
contrast, it shows continuous flow in an SVA. Therefore, we believe that the typical
EUS findings of an SVA are focal dilatation of the splenic vein in B-mode images with
continuous flow in the pulsed-wave Doppler mode.
The best treatment strategy for incidentally detected asymptomatic SVAs remains controversial
[2]
[3]. We elected to monitor this lesion rather than perform surgery, and there was no
change on either abdominal ultrasound or EUS at the 48-month follow-up. To our knowledge,
this is the first reported case of an SVA diagnosed by EUS.
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