Normal lymph nodes are less than 3mm.
Normal lymph node appearance=Oval or reniform, smooth margins, uniform peripheral cortex, minimal thickness of cortex 3mm or less

Abnormal lymph nodes are ≥ 3mm, but can be considered okay if they are seen in both axilla’s/symmetrical. Abnormal appearance= round, heterogenous, Cortex ≥ 3mm, Cortical bulge or lobulation.

Typical Protocol: If all lymph nodes have an otherwise normal appearance, oval with a fatty hilum, but the cortex is thick, measure the lymph node with the thickest cortex and show with and without color. If the lymph node is otherwise morphologically normal in appearance there’s no need to measure in three planes.

Abnormal appearance: measure in three planes and show with and without color.