Initial Approach to Lymphadenopathy

Diagnostic Approach

The American College of Radiology recommends beginning with ultrasound imaging of the affected lymph node regions to characterize size, consistency, and features, followed by a targeted history and a complete blood count with differential 1
The American College of Radiology and other guideline societies suggest that ultrasound of affected lymph node regions is the primary modality to characterize nodes as solid versus cystic, assess size and features 1, 5
A complete blood count with differential is essential to evaluate for leukemia, lymphoma, or infectious causes, and abnormal results may indicate the need for further investigation, such as excisional biopsy 3

The Annals of Oncology guidelines suggest assessing for hepatosplenomegaly, as it may indicate systemic disease such as lymphoma or leukemia 3
Tuberculosis testing, such as interferon-gamma release assay or tuberculin skin test, is particularly important in endemic areas 4

Excisional biopsy is mandatory for supraclavicular lymphadenopathy due to high risk of serious pathology, providing adequate tissue for histology, immunophenotyping, and ancillary studies 2
The American College of Radiology and Praxis Medical Insights recommend proceeding directly to excisional biopsy for nodes >2 cm that persist beyond 4 weeks, hard, matted, or fixed nodes, or when constitutional symptoms are present 2, 3

Bilateral lymphadenopathy in an adolescent raises specific concerns, including lymphoma, which commonly presents with bilateral cervical or supraclavicular adenopathy 2
Tuberculosis must be considered, especially in endemic areas or with known exposures, and tuberculosis testing is recommended 4