Halo sign and vascularization
We demonstrate the various forms of vascular patterns in thyroid nodules.
None of the nodules shows either vascularization or halo sign.
The nodule has halo and presents neither perinodular nor intranodular vascularity.
The nodule does not show halo sign but displays perinodular blood flow.
The nodule has a complete halo and presents perinodular blood flow at around 50% of its circumference.
The nodule has no halo and shows an irregularly increased intranodular vascularization.
The nodule has no halo. The presence of perinodular vascularization is doubtful while the intranodular vascularity is minimal.
The nodule has not halo. The intranodular vascularization is substantially increased.
The presence of halo is doubtful. The intranodular vascularization is irregularly increased.