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Optimal cutoff value of variables for identifying metastatic axillary lymph nodes. (A) Cortex ≤3 mm, presence of hilum, oval shape, S ≤ 9 mm, and L/S ≥ 1.7 usually indicate a normal lymph node. (B) Cortex >3 mm, non-hilum, round shape, S > 9 mm, and L/S < 1.7 mostly indicate a metastatic lymph node. L, long-axis diameter; S, short-axis diameter; L/S, ratio of long-/short-axis.
