Popliteal Lymph Node Evaluation

Physical Examination Features

A normal popliteal lymph node should feel soft, mobile, small (typically <1.5 cm), and have a smooth, well-defined border, according to the American Academy of Otolaryngology-Head and Neck Surgery 1
Soft texture is characteristic of benign lymph nodes, often due to tissue edema in reactive nodes, as noted by the American Academy of Otolaryngology-Head and Neck Surgery 1
Mobile and non-fixed to adjacent tissues, as benign nodes do not invade surrounding structures, as stated by the American Academy of Otolaryngology-Head and Neck Surgery 1
Smooth borders that are well-defined on palpation, as described by a medical guideline society 2

Nodes <1.5 cm are generally considered within normal limits, according to the American Academy of Otolaryngology-Head and Neck Surgery and other medical guidelines 1, 3
Nodes >1.5 cm should raise suspicion for pathology and warrant further workup, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery and other medical guidelines 1, 3

Firm or hard consistency suggests malignancy, as malignant nodes lack tissue edema, according to the American Academy of Otolaryngology-Head and Neck Surgery 1
Fixed or reduced mobility indicates potential capsular invasion and adherence to adjacent structures, as noted by the American Academy of Otolaryngology-Head and Neck Surgery 1
Size >1.5 cm is a key threshold for increased malignancy risk, as stated by the American Academy of Otolaryngology-Head and Neck Surgery and other medical guidelines 1, 3
Associated symptoms such as skin lesions on the lower leg, unexplained weight loss, or constitutional symptoms increase concern, according to the American Academy of Otolaryngology-Head and Neck Surgery 1

Any palpable firm node regardless of size should prompt imaging evaluation, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 1
Nodes >1.5 cm require definitive workup with ultrasound or biopsy, according to the American Academy of Otolaryngology-Head and Neck Surgery and other medical guidelines 1, 3
Persistent nodes >2 weeks without clear infectious etiology warrant investigation, as stated by the American Academy of Otolaryngology-Head and Neck Surgery 1