Ultrasound Appearance of Axillary Lymph Nodes

Abnormal lymph node with eccentric cortical thickening
  • This axilla ultrasound shows a case of severe eccentric compression and displacement of the hilum to the edge of the node:
    • Favoring metastatic disease
  • Typical lymph node ultrasound appearances include:
    • Uniformly mildly thickened cortex
      • Typical of inflamed or reactive lymph node
    • Eccentric cortical thickening:
      • Favors metastatic disease (Image)
    • Convex indentations of the hilum:
      • Favors metastatic disease
    • Severe compression of the hilum to slit-like configuration:
      • Can occur in metastatic or severely inflamed lymph node
    • Severe eccentric compression and displacement of the hilum to the edge of the node:
      • Favoring metastatic disease
    • Complete obliteration of the hilum and rounding of the node:
      • Favoring metastatic disease:
        • Can also occur in severe necrotizing lymphadenitis
    • Perinodal invasion by metastasis:
      • The outer thin echogenic capsule cannot be identified:
        • Angular margins
Severe eccentric compression and displacement of the hilum to the edge of the node.
  • References
    • Stavros AT. Evaluation of regional lymph nodes in breast cancer patients. In: Stavros AT. Breast Ultrasound. Philadelphia, PA: Lippincott Williams & Wilkins; 2004:858-859.
    • AIUM curriculum for fundamentals of ultrasound physics and instrumentation. JUltrasound Med 2019;38(8):1933-1935. https://onlinelibrary.wiley.com/doi/epdf/10.1002/jum.15088. Accessed July 16, 2020.
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