Discuss the clinical approach to a patient presenting with fever, lymphadenopathy, splenomegaly and thrombocytopenia.
Definition & Significance
This triad is a classic examination case because it narrows a very wide differential to three groups: infection, haematological malignancy and connective tissue disease. The combination indicates involvement of the reticuloendothelial system — lymph nodes, spleen and bone marrow are all reacting to, or infiltrated by, the same process.
Causes BY Combination
| Combination | Key Causes | First Investigations |
|---|---|---|
| Fever + generalised LAD | EBV (infectious mononucleosis), CMV, toxoplasmosis, HIV, secondary syphilis, TB, brucellosis, typhoid; Hodgkin's & non-Hodgkin's lymphoma, CLL; SLE, adult Still's disease | Monospot/EBV serology, HIV, blood film, CXR, node biopsy |
| Fever + splenomegaly | Malaria, kala-azar (visceral leishmaniasis), enteric fever, infective endocarditis, brucellosis; CML, CLL, lymphoma, myelofibrosis | Peripheral smear for parasites, rK39 for kala-azar, blood cultures, BM aspirate |
| Fever + thrombocytopenia | Dengue, malaria, sepsis/DIC, scrub typhus, leptospirosis, HIV; ITP, TTP, aplastic anaemia, leukaemia | NS1/dengue serology, smear, coagulation profile, LDH |
| All three together | Kala-azar, malaria, dengue, disseminated TB, EBV/CMV, HIV, lymphoma, CLL, SLE, haemophagocytic lymphohistiocytosis (HLH) | Bone marrow aspirate + biopsy, ferritin, triglycerides |
In India, the three commonest causes of this exact triad are malaria, kala-azar and dengue. Kala-azar is suggested by massive splenomegaly + pancytopenia + hyperpigmentation in a patient from Bihar, Jharkhand, West Bengal or eastern UP.
Clinical Approach
History:
- duration and pattern of fever
- travel to endemic zones
- contact with tuberculosis
- animal exposure (brucella, toxoplasma)
- sexual history and IV drug use
- drug intake (phenytoin, carbamazepine cause pseudolymphoma)
- weight loss and night sweats (B symptoms of lymphoma).
Examination: map all node groups — size, consistency, tenderness, matting, fixation. Note that hard, matted, non-tender, fixed nodes suggest malignancy, whereas tender, mobile nodes suggest infection. Record spleen size in centimetres below the costal margin. Look for pallor, petechiae, oral ulcers, rash, arthritis, hepatomegaly and Waldeyer's ring involvement.
Investigations — Stepwise
- First line: complete blood count with peripheral smear (atypical lymphocytes in EBV; blasts in leukaemia; malarial parasite; schistocytes in TTP), ESR, CRP, LFT, RFT, LDH, urine routine.
- Infective screen: blood cultures (three sets), Widal/typhidot, dengue NS1 & IgM, rapid malaria antigen, rK39 for kala-azar, Mantoux, HIV ELISA, EBV/CMV serology, Brucella agglutination.
- Imaging: chest X-ray (mediastinal widening — lymphoma, TB, sarcoidosis); ultrasound abdomen; CECT chest/abdomen/pelvis for occult nodes; PET-CT where lymphoma is suspected.
- Definitive: excisional lymph node biopsy (never FNAC alone if lymphoma is suspected — architecture is needed); bone marrow aspiration and biopsy for infiltration, LD bodies of kala-azar or haemophagocytosis.
- If HLH suspected: ferritin (typically > 500, often > 10 000 ng/mL), triglycerides, fibrinogen, soluble CD25.
Take blood cultures at the peak of fever — bacteraemia is highest then. Ask for excisional node biopsy in your answer; writing "FNAC" for suspected lymphoma loses marks.
Red Flags Demanding Urgent Work-up
- Node > 2 cm, hard, fixed, or supraclavicular in location (Virchow's node).
- Progressive painless enlargement with drenching night sweats and > 10% weight loss.
- Pancytopenia, blasts on smear, or rapidly falling platelets with bleeding.
Kala-azar endemic-state list and rK39 sensitivity — confirm against current NVBDCP/National Kala-azar Elimination Programme figures.
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