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FIG 3. A, Beam hardening at the level of the thyroid isthmus results in decreased soft-tissue contrast and obscures the vascular malformation (arrow) anterior to the right sternocledomastoid muscle, which is better seen in panel B, with the swimmer’s position (open arrow). This lesion had been present and stable for many years and may actually represent a type II or III branchial cleft cyst, as it lies anterior to the lowermost aspect of the sternocleidomastoid muscle. No tract was visible; thus, venous or lymphatic malformation was the favored diagnosis.
