Comprehensive Guide to Lymphadenopathy Examination and Causes

Overview

Lymphadenopathy refers to abnormal enlargement of lymph nodes. Accurate assessment requires systematic examination of the major nodal groups, determination of whether enlargement is clinically significant, and identification of underlying causes.

Major Lymph Node Groups to Examine

• Cervical (horizontal/superficial and vertical/deep)
• Supraclavicular
• Axillary (anterior, posterior, central, apical, lateral)
• Inguinal (superficial: horizontal & vertical; deep: femoral canal – "cloquet" nodes)

Palpation Techniques

• Cervical nodes: Stand behind the patient, ask them to tilt the head toward the side being examined to relax fascia.
• Axillary nodes: Patient rests arm over examiner’s arm; palpate anterior fold, central, apical, posterior, and lateral nodes.
• Supraclavicular nodes: Feel the area between the anterior and posterior heads of the sternocleidomastoid.
• Inguinal nodes: Palpate along the inguinal ligament (horizontal) and perpendicular to it (vertical); deep nodes are felt in the femoral canal.

Determining Clinical Significance

• Size thresholds:
• Cervical or axillary: >1 cm (some texts >1.5 cm for axillary)
• Inguinal: >2 cm
• Any palpable epitrochlear node is considered significant.
• Tenderness suggests infection.
• Consistency:
• Hard, rubbery → malignancy (e.g., Hodgkin lymphoma)
• Soft → reactive or infectious.
• Matted vs. discrete: Matted nodes indicate chronic inflammation or tuberculosis.
• Mobility: Fixed nodes raise suspicion for malignancy.

Generalized vs. Localized Lymphadenopathy

• Generalized: ≥2 non‑contiguous nodal regions; usually systemic disease.
• Localized: Single nodal region; may be due to local pathology or early systemic disease.

Systemic Causes of Generalized Lymphadenopathy

• Infections: TB, typhoid, syphilis, EBV, HIV, toxoplasmosis, histoplasmosis.
• Autoimmune: SLE, sarcoidosis, juvenile idiopathic arthritis.
• Hypersensitivity: Kawasaki disease.
• Neoplasms: Lymphomas, leukemias.
• Drugs: Phenytoin, captopril, carbamazepine.

Localized Causes by Nodal Region

• Cervical:
• Local infections: tonsillitis, pharyngitis, posterior nasal infections, TB.
• Cancers: tonsillar, nasopharyngeal, laryngeal, thyroid, lung.
• Wood’s nodes (chronic tonsillitis).
• Axillary:
• Limb infection, breast abscess.
• Breast carcinoma, melanoma of the upper limb.
• Supraclavicular:
• Left‑sided enlargement = Virchow’s sign (Troisier’s sign).
• Indicates thoracic or abdominal malignancies (breast, lung, GI, bladder, gonadal). GI cancers are especially important due to thoracic duct drainage.
• Inguinal:
• Vertical group drains lower limb → cellulitis, lymphedema, melanoma of leg.
• Horizontal group drains perineum, scrotum, anus below dentate line.
• Testes/ovaries drain to para‑aortic nodes; inguinal involvement occurs only with scrotal skin spread.
• Specific infections: syphilis, cat‑scratch disease.

Practical Examination Checklist

1. Identify nodal group and size.
2. Assess tenderness.
3. Evaluate consistency (soft, firm, rubbery).
4. Determine if nodes are discrete or matted.
5. Test mobility relative to skin and underlying structures.
6. Correlate findings with possible local or systemic etiologies.

Management Implications

• Significant, hard, fixed, or matted nodes warrant imaging and possible biopsy.
• Tender, soft, mobile nodes often resolve with treatment of the underlying infection.
• Persistent generalized lymphadenopathy should prompt evaluation for systemic disease.

Accurate lymph node assessment—knowing the key nodal groups, proper palpation technique, size criteria, and characteristic exam findings—allows clinicians to differentiate benign reactive enlargement from serious systemic or malignant disease without needing further imaging in many cases.