BI-RADS US:

http://www.radlex.org/RID/RID1517

Axillary lymph nodes are often visible on mammograms. Normal nodes are smaller than 2 cm and contain hyperechoic fatty hilar areas. Larger nodes may be normal when a very thin cortical rim is seen around the hilar fat. Enlarged round lymph nodes or those with small or no fatty hilar areas are abnormal, although there is no specific feature or finding to distinguish a nodal metastasis from a benign reactive node. Presence of fat in the nodal hilus does not exclude metastatic involvement; replacement of the node by tumor may be a gradual process best detected by interval change. In a patient with breast cancer, a cortical bulge or cortical area of increased echogenicity may suggest tumor involvement. A normal lymph node can be up to 2 cm in longest dimension. Larger lymph nodes, 3 cm or longer, with very thin cortical rims and most of the node consisting of fat, are also normal. Large rounded nodes lymph nodes, 3 cm or longer, with very thin cortical rims and most of the node consisting of fat, are also normal. Large rounded nodes with a paucity of hilar fat or none at all, should be evaluated further and correlated clinically.

BI-RADS US:

276805

RID1517

http://www.radlex.org/RID/RID34345

axillary lymph node

RID1:RID1517

axillary lymph node

3.12 def, source

BI-RADS 5, BI-RADS 4, Playbook

http://www.radlex.org/RID/RID28895