Intact "halo" on thyroid ultrasound
Another in a series of "snapshots" of thyroid ultrasound. All cases are FNA correlated.
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The teaching point in this case is to demonstrate what an intact halo looks like. Look at case 21888 for a comparison of an absent "halo".
This is a finding that needs to be present in all orientations of imaging around the whole lesion. Its favors benign cytology as an isolated finding.