Cervical
Infections: pharyngitis, dental abscess, otitis media and otitis externa, infectious mononucleosis, toxoplasmosis, cytomegalovirus, hepatitis, adenovirus, rubella
Malignancies: Hodgkin's disease, non-Hodgkin's lymphoma, squamous cell carcinoma of the head and neck
Kikuchi disease
Supraclavicular and prelaryngeal
Virchow node: abdominal and thoracic neoplasm
Delphian node: thyroid and laryngeal disease
Infections: mycobacterial (e.g., scrofula), fungal
Axillary
Infections: staphylococcal and streptococcal arm infections, cat-scratch fever, tularemia, sporotrichosis
Malignancies: breast carcinoma, Hodgkin's disease, non-Hodgkin's lymphoma, melanoma
Epitrochlear
Lymphoproliferative disorders
Connective tissue diseases and sarcoidosis
Dermatologic diseases
“Historical” associations: syphilis, leprosy, leishmaniasis, rubella
Inguinal
Benign reactive (especially in shoeless walkers)
Malignancies: Hodgkin's disease, non-Hodgkin's lymphoma, melanoma, squamous cell carcinoma of the penis and vulva, anal cancer
Infections: cellulitis, venereal disease
Hilar
Unilateral
	Infections: bacterial pneumonia, mycobacterial diseases, fungal infections, tularemia, psittacosis, pertussis
	Other granulomatous diseases
	Malignancies: bronchogenic carcinoma, metastatic breast cancer and gastrointestinal cancers, non-Hodgkin lymphoma, Hodgkin disease
Bilateral
	Granulomatous diseases: sarcoidosis, berylliosis, etc.
	Bilateral infections
	Malignancies: non-Hodgkin's lymphoma, Hodgkin's disease, metastatic carcinoma
	Calcified: tuberculosis, histoplasmosis, silicosis
Mediastinal
Exclude other causes of mediastinal widening
Differential diagnosis is similar to that for hilar lymphadenopathy
Abdominal
Malignancies: metastatic adenocarcinoma (including gastric), non-Hodgkin lymphoma, transitional cell carcinoma of the urinary collecting system, chronic lymphocytic leukemia, hairy cell leukemia, Hodgkin disease (rarely mesenteric)
Tuberculosis
Generalized
Hematologic malignancies: non-Hodgkin's lymphoma, Hodgkin's disease, chronic lymphocytic leukemia, acute lymphocytic leukemia
Infections: infectious mononucleosis, cytomegalovirus, human immunodeficiency virus, tuberculosis, toxoplasmosis, histoplasmosis, coccidioidomycosis, brucellosis
Rheumatoid arthritis, systemic lupus erythematous
Sarcoidosis
Angioimmunoblastic lymphadenopathy