benign adenoma showed large amount of blood flow.
spectral doppler showed low peak systolic velocity and prominent diastolic flow.

papillary carcinoma showed moderate amount of blood flow.

spectral doppler showed higher peak systolic velocity with relatively less diastolic flow than within benign nodule.

thyroid nodule with calcified rim(the presence of internal coarse or peripheral eggshell-type calcifications suggest benign lesion ).

1cm hyper echogenic nodule


Other benign features include hyperechogenicity relative to the adjacent parenchyma

Benign cystic nodule with dependent debris.

Typical benign nodules are well-marginated, mostly cystic masses that almost always contain internal debris

In multiloculated benign cystic lesions, internal septa may be thickened but should be devoid of vascular flow.