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FIG 1. Images from the case of a 4-year-old child with a cystic hygroma. Comparison with images obtained at the age of 2 years.
A, Axial postcontrast CT image of the neck at the level of the mandibular angle obtained during the current admission. It shows the cystic hygroma to be increased in size and the vascular structure to be markedly enlarged (arrow).
B, Pulsed Doppler sonography image of the neck posterior to the left mandibular angle shows spectra with slow-velocity blood flow from the ovoid vascular lesion (obtained during current admission).
C, Axial postcontrast CT image of the neck obtained at the age of 2 years reveals bilateral multiloculated cystic hygromas more prominent over the left side. A well-defined ovoid vascular structure (arrow) is seen within a cystic sac posterior to the mandibular angle.
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