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File:Ultrasonography of a normal lymph node.jpg|thumb|A typical '''normal lymph node''': smooth, gently lobulated oval with a hypoechoic cortex measuring less than 3 mm in thickness with a central echogenic hilum.<ref name=Dialani2014>{{cite journal|last1=Dialani|first1=V.|last2=James|first2=D. F.|last3=Slanetz|first3=P. J.|title=A practical approach to imaging the axilla|journal=Insights into Imaging|volume=6|issue=2|year=2014|pages=217–229|issn=1869-4101|doi=10.1007/s13244-014-0367-8}} Creative Commons attribution license</ref>
File:Ultrasonography of a '''suspected malignant lymph node''', with Doppler.jpg|A '''suspected malignant lymph node''':<br>- Absence of the fatty hilum<br>- Increased focal cortical thickness greater than 3 mm <br>- [[Doppler ultrasonography]] that shows hyperaemic blood flow in the hilum and central cortex and/or abnormal (non-hilar cortical) blood flow.<ref name=Dialani2014/>
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