Fig. 9

Sono-histological architecture of lymph nodes. Histological samples of reactive lymph nodes (A, C) clearly show how the feeding microvasculature (yellow arrowhead) enters through the hilum (H) to progressively branch smaller ramifications (white arrowheads) toward the cortex (C)—i.e., the unipolar vascularization. Of note, all the aforementioned histological elements can be easily identified using modern high-frequency probes and high-sensitivity color/power Doppler (B). Vb: vascular bundle; H&E: hematoxylin & eosin