“…[7,20] It may show a cystic lesion, hypoechogenic to echofree mass, with no connections to vessels, sono compressible, sharply outlined, with no internal perfusion. [2,4,9,10,12,18] In the acute phase, tomodensitometry can show a dilation of the thoracic duct or cysts located adjacent to the left internal jugular vein. [15,18] Cervical soft tissue surrounding the cyst can appear infiltrated with edematous fluid.…”