About This Page
This is a clinician-written, evidence-based guide aligned to the MCC Examination Objectives. It is structured by clinical presentation — the way the MCCQE tests and the way patients actually present. Management reflects current Canadian guidelines (CMA, CFPC, CPS). Always cross-reference with institutional protocols and clinical judgment.
The Bottom Line
- Generalized lymphadenopathy means enlarged nodes in two or more non-contiguous regions; it is more concerning than a single local reactive node
- Must-not-miss causes include lymphoma, leukemia, metastatic malignancy, HIV, TB, and systemic inflammatory disease
- Red flags: supraclavicular node, hard/fixed/matted nodes, >2 cm, persistence >4-6 weeks, B symptoms, hepatosplenomegaly, cytopenias, or immunosuppression
- First-line workup includes careful node exam, CBC with differential/smear, ESR/CRP, HIV testing, EBV/CMV when compatible, TB testing/CXR when risk, and targeted tests based on history
- Excisional biopsy is preferred when lymphoma is suspected because fine needle aspiration may miss nodal architecture
Approach to the Presentation
Lymphadenopathy forces integration of infectious, hematologic, malignant, autoimmune, and medication causes. Confirm whether nodes are localized or generalized, then characterize size, tenderness, consistency, fixation, matting, location, and duration. Ask about fever, night sweats, weight loss, fatigue, sore throat, rash, oral/genital ulcers, dental infections, cat exposure, travel, TB contacts, sexual history, injection drug use, immunosuppression, medications, and cancer history. Examination should include full nodal survey, ENT/oral cavity, skin, breast/testes where relevant, abdominal exam for hepatosplenomegaly, and signs of autoimmune disease. The central decision is whether short follow-up is safe or whether urgent imaging/biopsy is required.
Differential Diagnosis
| diagnosis | likelihood | key features | distinguishing test |
|---|---|---|---|
| Lymphoma | must-not-miss | Painless rubbery nodes, B symptoms, pruritus, alcohol-induced node pain, mediastinal mass symptoms, splenomegaly | Excisional lymph node biopsy with histology and immunophenotyping |
| Leukemia or marrow malignancy | must-not-miss | Fatigue, bruising, infections, pallor, bone pain, hepatosplenomegaly, generalized nodes | CBC with differential, smear, flow cytometry, bone marrow biopsy |
| HIV seroconversion or chronic HIV | must-not-miss | Generalized nodes, fever, sore throat, rash, oral ulcers, weight loss, opportunistic infections, exposure risk | HIV Ag/Ab test ± HIV RNA if acute infection suspected |
| Tuberculosis or atypical mycobacterial infection | must-not-miss | Night sweats, fever, weight loss, TB exposure, immigration/travel risk, matted nodes, chronic cough | CXR, IGRA/TST, node biopsy/culture/AFB stain/NAAT when indicated |
| Metastatic malignancy | must-not-miss | Hard fixed supraclavicular nodes, smoking, GI symptoms, breast/testicular mass, skin lesion, older age | Targeted imaging and biopsy; examine drainage regions |
| EBV infectious mononucleosis | common | Teen/young adult, fever, pharyngitis, posterior cervical nodes, fatigue, splenomegaly, atypical lymphocytes | Heterophile antibody or EBV serology; CBC with atypical lymphocytes |
| CMV, toxoplasmosis, or other viral infection | common | Mononucleosis-like illness, pregnancy or immunosuppression relevance, cat exposure for toxoplasmosis | Serology based on context |
| Dermatologic or bacterial infection | common | Tender nodes draining cellulitis, wounds, scalp lesions, dental infection, cat scratch, STI | Clinical drainage-area examination; cultures/serology only when indicated |
| Autoimmune disease | less common | Rash, arthritis, photosensitivity, oral ulcers, sicca, pulmonary symptoms, erythema nodosum | ANA/ENA, RF/anti-CCP, CXR, calcium, biopsy if sarcoidosis suspected |
| Medication-related lymphadenopathy | less common | Temporal relationship with phenytoin, carbamazepine, allopurinol, sulfonamides, or drug hypersensitivity features | Medication history; eosinophilia/LFT abnormalities in DRESS |
Red Flags & Key History
Symptoms
Fever, drenching night sweats, or involuntary weight loss
Persistent nodes >4-6 weeks or progressive enlargement
TB exposure, chronic cough, hemoptysis, immigration/travel risk, homelessness, or incarceration
HIV risk, acute seroconversion symptoms, recurrent infections, or oral candidiasis
Recent new medication with rash, fever, facial oedema, or systemic symptoms
Sore throat, posterior cervical nodes, fatigue, and splenic discomfort
Cat exposure, skin wounds, dental infection, or STI symptoms
Signs
Supraclavicular lymphadenopathy, especially left-sided Virchow node
Hard, fixed, matted, non-tender nodes or nodes >2 cm
Hepatosplenomegaly
Pallor, petechiae, bruising, or recurrent infections
Tender mobile nodes near an obvious infection source
Approach to Investigation
First-line
Full nodal and systems examinationMap all nodal regions and examine drainage sites: scalp, ENT/oral cavity, skin, breast, abdomen, genital/testicular, and extremities
CBC with differential + peripheral smearLook for lymphocytosis, atypical lymphocytes, blasts, cytopenias, eosinophilia, or pancytopenia
ESR/CRP, LDH, liver enzymesInflammatory activity, tissue turnover, hepatic involvement, and lymphoma clues
HIV Ag/Ab testRecommended in unexplained generalized lymphadenopathy; consider HIV RNA if acute infection suspected
Second-line
EBV heterophile/serology, CMV, toxoplasmaOrder when compatible history and examination are present
CXR and TB testingIf cough, fever/night sweats, exposure risk, immigration/travel risk, immunosuppression, or persistent unexplained nodes
ANA/autoimmune testsOnly when features suggest systemic autoimmune disease
Ultrasound or CTUltrasound can characterize superficial nodes; CT if malignancy, deep nodes, mediastinal symptoms, or staging required
Specialist
Excisional lymph node biopsyPreferred when lymphoma is suspected because architecture is required
Hematology referralB symptoms, supraclavicular nodes, abnormal CBC/smear, hepatosplenomegaly, or persistent unexplained generalized lymphadenopathy
Infectious diseases referralComplex HIV/TB, immunocompromised host, persistent fever, or unusual exposure-related lymphadenopathy
Management Principles
Canadian primary care and hematology referral principles + Choosing Wisely Canada1
Risk stratify
- If nodes are small, tender, mobile, clearly reactive, and associated with a self-limited infection: treat the source and reassess
- If generalized, persistent, supraclavicular, hard/fixed, or associated with systemic symptoms: investigate promptly and refer
- Do not give empiric corticosteroids before biopsy if lymphoma is possible because histology may be obscured
2
Treat likely benign causes
- Viral illness/EBV: supportive care, hydration, analgesia, and avoid contact sports if splenomegaly
- Bacterial source: targeted antibiotics only when clinical bacterial infection is present
- Medication reaction: stop culprit medication when safe and assess severity; DRESS requires urgent specialist care
3
Malignancy pathway
- Arrange urgent imaging/biopsy and hematology/oncology referral for red flags
- Check CBC/smear, LDH, and uric acid if high tumour burden suspected
- Provide safety-netting and explicit follow-up date rather than vague reassurance
4
Communication
- Explain why some nodes can be observed while others require biopsy
- Discuss HIV/TB testing respectfully and normalize testing as part of generalized lymphadenopathy assessment
Complications & Pitfalls
- Steroids before diagnosis: Avoid empiric corticosteroids in suspected lymphoma unless directed by a specialist or airway compromise exists.
- Missing supraclavicular nodes: These carry high malignancy risk.
- Relying on tenderness: Tender nodes can still be serious; persistence and systemic features matter.
- Fine needle aspiration pitfall: FNA may be inadequate for lymphoma because architecture is needed.
- Failure to examine drainage regions: A skin, oral, breast, genital, or testicular lesion may be the diagnostic clue.
MCCQE1 Exam Tips
- 1Generalized lymphadenopathy + B symptoms = lymphoma, HIV, or TB until proven otherwise
- 2Supraclavicular node in an adult is malignant until proven otherwise
- 3For suspected lymphoma, excisional biopsy is the best diagnostic test
- 4EBV clue: fever + pharyngitis + posterior cervical nodes + splenomegaly; avoid the amoxicillin rash trap
- 5MCC questions often test safe sexual history and HIV testing as routine, non-judgmental care
- 6Do not over-order autoimmune panels unless systemic features exist
- 7Abnormal CBC with blasts or cytopenias changes the presentation from watchful waiting to urgent hematology assessment
practicetest your knowledge on lymphadenopathy (generalized)Apply what you've learnt with MCCQE1-style questions from the iatroX Q-Bank — general & constitutional and beyond.
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