Lymph Nodes

Published on 06/02/2015 by admin

Filed under Anesthesiology

Last modified 22/04/2025

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25 Lymph Nodes

Normal lymph nodes are well-defined, oval structures containing an echogenic hilum and hypoechoic rim. Central vascularity can be demonstrated on Doppler scans (a hilar pattern of blood flow). Inguinal lymph nodes are frequently encountered during femoral nerve blocks. Lymph nodes are more numerous in young patients. Nodes involute with aging. Normal lymph nodes are small with well-defined borders.

Clinical Pearls

• Reactive lymph nodes are sometimes identified during regional blocks.

• Lymph nodes are small, oval, or reniform (bean shaped).

• Lymphatic vessels resemble veins in structure, but valves are more numerous in lymphatic vessels. The lymphatic vessels primarily contain lymphocytes (not erythrocytes).

image

FIGURE 25-1 Ultrasound appearance of a lymph node in the inguinal region. This node was observed during femoral nerve block with ultrasound guidance.

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