Abstract
A 10-year-old male child without a history of trauma or inflammation was referred to the Kyushu University Hospital for a soft and compressible mass in the right side of the neck during straining. The swelling was not observed at rest, but on Valsalva maneuver, the mass appeared in the right side of the neck without pain, bruit, or pulsation. Ultrasonography and color Doppler flow imaging during Valsalva maneuver demonstrated local dilatation of the right internal jugular vein (IJV) without thrombosis (Figure 1).
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