Lymphadenopathy Evaluation and Management

Infectious Causes

Encapsulated organisms, particularly Streptococcus pneumoniae and Haemophilus influenzae, cause recurring lymphadenopathy, especially in patients with underlying immune dysfunction or antibody deficiencies 1, 2
Mycobacterial infections, particularly tuberculosis, should be considered in patients with persistent adenopathy accompanied by fever, night sweats, or weight loss 1
Staphylococcus aureus and gram-negative pathogens occur more commonly in advanced disease states and during neutropenia 2
HIV infection causes generalized lymphadenopathy through multiple mechanisms including direct marrow suppression, immune-mediated destruction, and opportunistic infections 1, 3
Epstein-Barr virus (EBV) and cytomegalovirus (CMV) produce lymphadenopathy, particularly in immunocompromised hosts 1

Chronic lymphocytic leukemia (CLL) and non-Hodgkin lymphoma are primary causes of recurring lymphadenopathy, with lymphoma producing adenopathy through marrow infiltration, hypersplenism, or autoimmune mechanisms 1, 2, 3
Multiple myeloma patients develop functional hypogammaglobulinemia despite elevated total immunoglobulin levels, predisposing to infections and lymphadenopathy 2
Lymphoproliferative malignancies cause bone marrow infiltration with malignant cells, resulting in leukopenia and dysfunctional immune cell production 2
Metastatic solid tumors should be considered, particularly with supraclavicular or epitrochlear node involvement, as these locations are highly suspicious for malignancy 1

Common variable immunodeficiency (CVID) presents with lymphadenopathy in 15-20% of patients, representing the most common primary immunodeficiency category associated with recurring adenopathy 1
Autoimmune lymphoproliferative syndrome (ALPS) characteristically presents with chronic lymphadenopathy, hepatosplenomegaly, and autoimmune cytopenias 1, 4

Systemic lupus erythematosus and rheumatoid arthritis cause generalized lymphadenopathy through immune complex deposition and chronic inflammation 1
Mevalonate kinase deficiency presents with recurrent fever and lymphadenopathy 1

Sarcoidosis commonly presents with bilateral hilar lymphadenopathy; asymptomatic bilateral hilar adenopathy is confirmed as sarcoidosis in 85% of cases, though alternative diagnoses including tuberculosis (38%) and lymphoma (25%) must be excluded 5
Sarcoidosis with Löfgren's syndrome, lupus pernio, or Heerfordt's syndrome has sufficiently high clinical suspicion that lymph node sampling may not be required 5

HIV infection with high viral loads and low CD4+ counts causes recurring lymphadenopathy through multiple mechanisms 1, 3
Iatrogenic immunosuppression from methotrexate, corticosteroids, and chemotherapy agents increases infection risk and causes drug-induced lymphadenopathy 1, 3
CAR T-cell therapy produces prolonged cytopenias and lymphadenopathy weeks to months after infusion 3
Heavily pretreated patients receiving multiple chemotherapeutic regimens face dramatically increased infection risk, with nearly 90% experiencing serious infectious complications 2