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OverviewAetiologyPathophysiologyClinical features and red flagsInvestigationsDifferential diagnosisManagementComplicationsMonitoring and follow-upSpecial situationsCommon pitfallsQuestionsSources
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Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.

Lymphadenopathy and splenomegaly

Haematology and transfusion · UK scope · Sources checked 27 Aug 2026 · Clinical review pending

RapidFull
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Time-critical presentation

Stridor, facial or upper-limb swelling, severe breathlessness, neurological compromise, suspected superior vena cava obstruction, left-upper-quadrant pain with shock, overwhelming infection after splenectomy, or rapidly progressive nodes with cytopenia requires urgent assessment. Avoid empirical corticosteroids before diagnostic tissue unless a specialist judges that airway, cord or other organ threat outweighs loss of histological yield.

Overview

Assess enlarged lymph nodes and spleen by distribution, tempo and systemic context, identify malignancy or infection requiring urgent action and choose imaging, blood or tissue tests that preserve diagnostic value.

Lymph nodes enlarge when immune cells proliferate, inflammatory cells accumulate, malignant cells replace tissue or drainage is obstructed. The first clinical task is anatomical: localised nodes direct examination to their drainage territory, whereas nodes in two or more non-contiguous regions suggest a systemic process. Tempo matters. Acute painful enlargement with a nearby infection differs from a steadily growing painless node over weeks. Children and young adults commonly have reactive nodes, but age does not neutralise red flags and a persistent unexplained mass still requires a documented review point.

Splenomegaly shares some causes but adds haemodynamic and sequestration mechanisms. Portal hypertension congests the spleen; haemolytic disorders increase reticuloendothelial work; infection and immune disease activate splenic tissue; lymphoma, leukaemia and myeloproliferative neoplasms infiltrate it. Very large enlargement particularly suggests selected myeloid, lymphoid, parasitic or storage diseases rather than uncomplicated viral infection. Examination records the distance below the costal margin, tenderness and signs of liver disease, but ultrasound or CT provides objective size and associated anatomy.

Aetiology

01

Infective immune stimulation

Viral, bacterial, mycobacterial and parasitic infections enlarge nodes through antigen-driven lymphoid proliferation and can enlarge the spleen through reticuloendothelial activation or sequestration.

02

Haematological malignancy

Lymphoma, leukaemia and myeloproliferative neoplasms infiltrate nodes, spleen, blood or marrow, often producing constitutional symptoms, cytopenias or a clonal circulating population.

03

Metastatic solid cancer

Malignant cells drain to regional nodes or spread systemically; node territory, primary-site symptoms and tissue architecture guide origin and staging.

04

Inflammatory and congestive disease

Autoimmune disease, sarcoidosis, medicines, portal hypertension, haemolysis and storage disorders enlarge lymphoid or splenic tissue through inflammation, congestion, sequestration or infiltration.

Pathophysiology

  1. 1
    Antigen-driven expansion

    Infection or inflammation activates lymphocytes and macrophages within organised nodal compartments, producing tender or generalised reactive enlargement.

  2. 2
    Clonal tissue replacement

    A malignant lymphoid or myeloid clone expands within nodes, spleen and marrow, disrupting architecture and normal blood-cell production.

  3. 3
    Reticuloendothelial sequestration

    An enlarged congested or hyperactive spleen pools and removes red cells, white cells and platelets, sometimes producing multilineage cytopenia.

  4. 4
    Capsular and local effects

    Rapid splenic or nodal expansion stretches capsules and compresses adjacent airway, vessels, nerves or abdominal organs, creating pain and emergency syndromes.

Clinical features and red flags

Reactive local node

Tender mobile enlargement in the drainage field of tonsillar, dental, skin or limb infection supports reactive lymphadenopathy and should regress with the underlying process.

Lymphoma phenotype

Persistent painless rubbery or firm nodes, splenomegaly, drenching sweats, weight loss, fever or pruritus raises lymphoma, while normal blood counts do not exclude it.

Metastatic node phenotype

Hard fixed nodes, particularly supraclavicular or in a territory linked to a primary-site symptom, suggest metastatic carcinoma and require cancer-pathway evaluation.

Acute compressive diseaseRed flag

Stridor, dysphagia, facial swelling, venous distension or neurological deficit with cervical or mediastinal adenopathy indicates airway, vascular or neural compression.

Splenic rupture signalRed flag

Sudden left-upper-quadrant or shoulder-tip pain, guarding, syncope or shock in a patient with splenomegaly suggests rupture and concealed haemorrhage.

Hypersplenic pattern

Splenomegaly with anaemia, leucopenia or thrombocytopenia and a compensatory marrow response supports sequestration after marrow failure and immune destruction are considered.

Investigations

  1. 01
    FBC, film and reticulocytesFirst step
    Why
    Identify cytopenia, lymphocytosis, blasts, myeloid proliferation, haemolysis and hypersplenic response.
    Interpretation and limitations
    A normal count does not exclude lymphoma. Clonal-looking lymphocytes or immature myeloid cells direct flow or molecular testing, while multilineage cytopenia may require marrow assessment.
  2. 02
    Liver profile, LDH, renal, calcium and inflammatory markers
    Why
    Assess organ involvement and identify congestive, proliferative or inflammatory context.
    Interpretation and limitations
    LDH is non-specific and should not diagnose lymphoma alone. Liver synthetic or portal features support congestive splenomegaly; calcium or renal abnormalities may alter urgency and differential.
  3. 03
    Targeted infection testing
    Why
    Confirm clinically plausible EBV, CMV, HIV, tuberculosis or other infections.
    Interpretation and limitations
    Select tests from exposure, sexual health, travel and immune status. Heterophile tests vary with timing and age; positive tuberculosis immune tests do not by themselves prove nodal active disease.
  4. 04
    Ultrasound of node or spleen
    Why
    Confirm anatomy, measure spleen and guide a safe tissue approach.
    Interpretation and limitations
    Morphological features can stratify concern but cannot reliably exclude malignancy. Doppler helps avoid vascular structures and select a representative solid target.

Differential diagnosis

01

Reactive infection

Tender mobile nodes with a local infective source or compatible viral syndrome favour reactive disease, but persistence, progression or atypical features require reassessment.

02

Lymphoma or leukaemia

Firm persistent generalised nodes, splenomegaly, drenching sweats, weight loss, pruritus or cytopenias raise clonal disease and justify tissue-preserving referral.

03

Metastatic carcinoma

Hard fixed regional nodes, supraclavicular involvement or a primary-site symptom pattern suggest epithelial cancer; core or excision tissue should permit immunophenotypic classification.

04

Autoimmune or granulomatous disease

Rash, arthritis, uveitis, lung disease, hypercalcaemia or systemic inflammatory features support lupus, sarcoidosis or another immune process after infection and malignancy are assessed.

05

Portal or haematological splenomegaly

Liver disease and portal hypertension cause congestive enlargement, whereas haemolysis and myeloproliferative disease produce characteristic blood, film and constitutional patterns.

Management

01ThreatStabilise compression or ruptureFirst stepNodes or spleen are associated with airway, vascular, neurological or haemodynamic compromise.+
  1. 1Use ABCDE, senior surgical, haematology, oncology and critical-care help, cross-sectional or bedside imaging chosen for stability, and blood-bank preparation when internal bleeding is possible.
  2. 2PreferredPreferred management preserves diagnostic tissue while stabilising the threatened organ; corticosteroid, radiotherapy, surgery or endovascular alternatives require specialist choice because each can alter later pathology.
  3. 3EscalationEscalate suspected splenic rupture to emergency surgical and major-haemorrhage pathways and suspected airway or SVC compromise to monitored treatment without sending an unstable patient for routine outpatient biopsy.
02LocalisedReview or biopsy a regional nodeOne nodal region is enlarged without current compression, shock or severe systemic illness.

Complications

01

Airway or vascular compression

Bulky cervical or mediastinal nodes can compromise airway, superior vena cava or major vessels, causing stridor, facial swelling, hypoxia or neurological symptoms.

02

Splenic rupture

An enlarged friable spleen can rupture spontaneously or after modest trauma, causing left-upper-quadrant pain, shoulder-tip pain, shock and concealed haemorrhage.

03

Hypersplenism

Sequestration and accelerated removal of circulating cells produces anaemia, leucopenia and thrombocytopenia while marrow may remain appropriately active.

04

Infection and marrow failure

Progressive haematological malignancy or its treatment impairs normal immunity and haematopoiesis, causing infection, bleeding and symptomatic anaemia.

05

Diagnostic distortion

Empirical corticosteroids can shrink lymphoma and alter morphology, delaying definitive classification unless a time-critical compressive emergency justifies specialist-led treatment.

Monitoring and follow-up

  • For observed nodes, record exact site, dimensions, texture, symptoms and a review date; progression or failure to regress changes the pathway.
  • Trend FBC, film and organ profile when splenomegaly or systemic disease can cause sequestration, haemolysis or marrow infiltration.
  • Track every imaging, flow, microbiology and biopsy result to a named clinician and confirm that urgent cancer or haematology referrals were received.
  • After splenectomy or functional asplenia, verify vaccination, antibiotic-prevention and fever plans through current national and local guidance.
  • During treatment of lymphoma or infection, monitor node and spleen response alongside disease-specific biochemical and marrow endpoints rather than palpation alone.

Special situations

Nodes follow anatomy

A regional node is a map to the likely source. Oral, skin, breast, genital and limb examination can reveal a cause missed by indiscriminate blood testing.

Normal blood does not exclude lymphoma

Many lymphomas remain tissue based until advanced disease. Persistent high-risk nodes require biopsy reasoning even with normal FBC and LDH.

Steroids can erase evidence

Lymphoid tissue may involute rapidly after corticosteroids. Unless organ threat requires treatment, secure adequate diagnostic tissue first through the specialist team.

Spleen size is mechanistic

Massive enlargement narrows the differential towards myeloid, lymphoid, parasitic and storage causes; mild enlargement is broader and can be reactive.

Asplenic fever cannot wait

Loss of splenic function increases rapid invasive infection risk. Patients need an explicit prevention and emergency plan rather than vaccination alone.

Common pitfalls

  1. 01

    Calling a persistent supraclavicular node reactive without a review or tissue plan.

  2. 02

    Using normal FBC or LDH as a lymphoma rule-out test.

  3. 03

    Giving repeated antibiotics when there is no bacterial focus or response.

  4. 04

    Starting corticosteroids before lymphoma biopsy without an organ-threatening indication and specialist plan.

  5. 05

    Using fine-needle aspiration as the default lymphoma test when architecture is required.

  6. 06

    Failing to advise a patient with splenomegaly about trauma and rupture symptoms.

  7. 07

    Losing ownership of a biopsy addendum or molecular result after the preliminary report.

Practice

Two practice questions

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Question 1 of 2
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Haematology and transfusionOriginal SBA

Persistent supraclavicular node

A 58-year-old has a painless enlarging left supraclavicular node for six weeks, weight loss and a normal full blood count. What is the most appropriate next approach?

Choose one answer, then submit
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Sources and review status4 sources · checked 27 Aug 2026 · clinical review pending+
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 27 Aug 2026; clinical approval remains outstanding.

  • NICE NG12 suspected cancer recommendationsUrgent pathways for unexplained lymphadenopathy, splenomegaly and systemic symptoms.
  • NHS ruptured spleen guidanceRecognition and emergency response to splenic rupture.
  • NHS vaccinations without a functioning spleenNational vaccination context for asplenia and other risk groups.
  • NICE NG52 non-Hodgkin lymphoma recommendationsExcision biopsy as the initial tissue procedure when lymphoma is suspected and core biopsy when surgical risk outweighs its advantages.

Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

Authoring stateComplete draftClinical stateAwaiting reviewJurisdictionUnited Kingdom

Investigation is directed and tissue aware. FBC, film, LDH, liver profile and targeted infection testing are common initial studies, but broad low-probability serology creates false positives. Ultrasound can distinguish node, cyst and vascular structure and guide core sampling; contrast CT maps deep nodal stations and organ involvement. When lymphoma is plausible, discuss biopsy with the receiving team before giving corticosteroids or choosing a low-yield sampling method. The endpoint is a diagnosis with stage and fitness information, not repeated scans of unexplained enlargement.

Key points

  • Confirm that a lump is a lymph node and map every region. Size alone is insufficient; site, consistency, tenderness, fixation, matting, skin change, duration and progression all alter probability.
  • Localised tender nodes usually follow drainage from infection or inflammation, while generalised lymphadenopathy broadens the differential to viral infection, HIV, tuberculosis, medicines, autoimmune disease and haematological malignancy.
  • Supraclavicular, persistent hard or fixed nodes, progressive enlargement, unexplained splenomegaly, cytopenias and systemic symptoms justify urgent cancer-pathway or haematology assessment under current NICE criteria.
  • Ask specifically about measured fever, drenching night sweats, unintentional weight loss, pruritus, recurrent infection, bruising, alcohol, travel, animal exposure, sexual health, tuberculosis risk and new medicines.
  • Examine liver, spleen, skin, joints, throat, breasts, testes and likely drainage territories. A palpable spleen generally implies enlargement, but ultrasound distinguishes spleen from a renal or other abdominal mass.
  • Use blood and imaging to choose tissue, not to avoid it. Excision preserves architecture and is often preferred for suspected lymphoma; core biopsy is an alternative when excision is impractical and adequate tissue can be obtained.
  • Fine-needle aspiration may answer selected metastatic-carcinoma questions but often cannot classify lymphoma because architecture, flow and molecular material are needed.
  • Give people with splenomegaly safety advice about contact trauma and urgent pain or collapse; after splenectomy, fever is an emergency requiring the established infection-prevention plan.
  • 05
    Contrast CT of neck, chest, abdomen and pelvis
    Why
    Map deep nodes, organ involvement and complications when malignancy or systemic disease is plausible.
    Interpretation and limitations
    Distribution supports staging and biopsy selection but is not a tissue diagnosis. Tailor field and contrast to the clinical question, renal function and pregnancy context.
  • 06
    Excision or image-guided core biopsy
    Why
    Preserve architecture and obtain immunophenotypic, molecular and microbiological material.
    Interpretation and limitations
    Excision is preferred when lymphoma is strongly suspected and accessible; core is an alternative when surgery is impractical. Coordinate fresh tissue for flow and culture before fixation.
    • +
    1. 1Examine the complete drainage territory, document size and texture, review infection and cancer symptoms and use targeted blood tests only when the history supports them.
    2. 2First linePreferredFor a clearly reactive phenotype, the first-line option is treatment or observation of the cause with a documented short review; persistent, enlarging, hard, fixed or supraclavicular nodes instead need preferred urgent imaging and tissue referral.
    3. 3AlternativeEscalationChoose excision when lymphoma architecture matters; core is an alternative after specialist discussion, while repeated empirical antibiotics or corticosteroids without a supported cause should trigger escalation.
    03SystemicInvestigate generalised nodes or splenomegalySeveral nodal regions, unexplained splenomegaly, constitutional symptoms or blood-count abnormalities suggest systemic disease.+
    1. 1Obtain FBC, film, reticulocytes, liver, renal, calcium and LDH tests plus exposure-directed infection and autoimmune testing; examine for liver disease, rash and marrow-failure signs.
    2. 2PreferredAlternativeThe preferred next step is contrast imaging to identify distribution and the safest highest-yield tissue target when malignancy remains plausible; blood flow or molecular testing is an alternative only for a suitable circulating clone.
    3. 3EscalationEscalate progressive cytopenia, very large spleen, blasts or systemic decline to haematology and arrange marrow or nodal tissue rather than extending a non-diagnostic serology panel.