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FIG 2. Case 2. Sonographic and MR images obtained in a 21-year-old woman with a left external jugular vein vascular malformation.
A, Transverse gray-scale sonography shows a hypoechoic heterogeneous mass (arrows) closely related to the external jugular vein (arrowheads).
B, Longitudinal gray-scale sonography shows a phlebolith (arrowheads) within the mass (arrows).
C, Axial T1-weighed spin-echo MR imaging image (TR/TE, 425/12) shows an isointense mass (arrows) closely related to the left external jugular vein (arrowhead). It is closely abutting the posterior edge of the left sternocleidomastoid muscle (asterisk).
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