Splenomegaly in Children: Clinical Case Discussion & Key Points
Model Case Presentation
Patient Demographics
Name: Master Arjun, Age: 6 years, Gender: Male, Informant: Mother (Reliable), Socioeconomic status: Lower middle class, rural
Chief Complaints
- Abdominal swelling / lump – 4 months
- Pallor and easy fatigability – 4 months
- Recurrent episodes of fever – 2 months
History Summary
A 6-year-old boy from a rural, malaria-endemic area presents with a progressively enlarging lump in the left side of the abdomen for 4 months. The mother noticed pallor and easy fatigability — the child tires quickly during play. He has had multiple episodes of high-grade fever with chills and rigors, each lasting 3–5 days, recurring approximately every 2–3 weeks, partially responding to antipyretics. No jaundice, no bleeding, no dark urine. No weight loss. Appetite slightly reduced.
Birth history uneventful. Growth and development previously normal. No similar illness in family. No blood transfusions in past. Consanguineous marriage (first-degree cousins). No pets. Travel history to a malaria-endemic forest area 6 months ago. Immunization up to date.
Examination Summary
| Parameter | Finding | Significance |
|---|---|---|
| Weight | 16 kg (expected ~21 kg) | Mild undernutrition |
| Pallor | Moderate pallor (conjunctivae, palms) | Chronic anemia |
| Icterus | Absent | No active hemolysis/liver disease at present |
| Cyanosis/Clubbing | Absent | — |
| Lymphadenopathy | Absent | Argues against lymphoma/leukemia |
| Spleen | 8 cm below LCM, crossing midline; Hackett Grade IV | Massive splenomegaly |
| Liver | 4 cm below RCM, firm edge | Hepatomegaly — hepatosplenomegaly |
Spleen characteristics: Smooth surface, firm consistency, non-tender, moves with respiration, notch palpable on medial border, cannot get above it, dull to percussion. Traube's space obliterated.
Abdomen: No ascites, no free fluid. Bowel sounds present.
Other systems: No murmur, no lymphadenopathy, no bone tenderness, no rash.
✅ Complete Diagnosis
Hyperreactive Malarial Splenomegaly (Tropical Splenomegaly Syndrome) with Hepatosplenomegaly and Hypersplenism causing Moderate Anemia — in a 6-year-old male from a malaria-endemic area.
Differential: Visceral Leishmaniasis (Kala-Azar), Thalassemia, Portal Hypertension, CML (must be excluded by investigations)
📝 History — Exam Q&A
Splenomegaly is enlargement of the spleen beyond normal age-related dimensions. Clinically, a spleen palpable more than 2 cm below the left costal margin (LCM) is considered enlarged.
Important note: A spleen is palpable (but not necessarily pathological) in up to 30% of normal newborns and 10% of 1-year-olds and 1% of older healthy children. A soft, non-tender spleen just palpable at the LCM in an infant may be physiological. Any spleen palpable >2 cm below LCM, or one that is firm, tender, or associated with symptoms warrants evaluation.
- Onset and progression: Duration, rate of growth of lump
- Fever: Pattern (cyclical → malaria; prolonged → kala-azar/typhoid), duration, severity
- Pallor/anemia: Easy fatigability, breathlessness, palpitations
- Jaundice: Suggests hemolytic anemia or liver disease
- Bleeding: Petechiae, purpura, epistaxis, gum bleeding → hypersplenism/leukemia
- Bone/joint pain: Malignancy, sickle cell crisis, storage disorder
- Weight loss, night sweats: Malignancy (Lymphoma), TB
- Travel history: Malaria-endemic or kala-azar-endemic areas
- Transfusion history: Prior anemia suggesting hemolytic conditions
- Family history: Hemolytic anemias (thalassemia, sickle cell, hereditary spherocytosis)
- Diet/nutrition: Assess overall health status
- Consanguinity: Risk of autosomal recessive disorders
| Category | Examples |
|---|---|
| Infections (most common overall) | Malaria, Kala-azar (Visceral Leishmaniasis), EBV (Infectious Mononucleosis), CMV, Typhoid, TB, Septicemia, Brucellosis, HIV, Schistosomiasis |
| Hematological | Hemolytic anemias (Thalassemia, Sickle cell disease, Hereditary spherocytosis, G6PD), Acute Leukemia, Lymphoma, CML, JMML |
| Congestive/Portal hypertension | Extrahepatic portal vein obstruction (EHPVO), Cirrhosis, Hepatic fibrosis, CCF with hepatic congestion |
| Storage disorders (Infiltrative) | Gaucher disease, Niemann-Pick disease, Mucopolysaccharidoses |
| Autoimmune/Inflammatory | SLE, Juvenile Idiopathic Arthritis (Systemic JIA), Autoimmune hemolytic anemia |
| Miscellaneous | Splenic cyst, Langerhans cell histiocytosis, Hemophagocytic lymphohistiocytosis (HLH) |
Massive splenomegaly = spleen extending to or crossing the umbilicus (Hackett Grade IV–V).
Mnemonic: "CHIKM"
- Chronic Myeloid Leukemia (CML) — commonest cause of massive splenomegaly
- Hyperreactive Malarial Splenomegaly (HMS / Tropical Splenomegaly Syndrome)
- Infective: Visceral Leishmaniasis (Kala-azar) / Schistosomiasis
- Kal-azar (Visceral Leishmaniasis)
- Myelofibrosis / Storage disorders (Gaucher disease) / Thalassemia major
💡 Classic Teaching
In Indian children, the top 3 causes of massive splenomegaly are: Kala-azar, Thalassemia major, and Hyperreactive Malarial Splenomegaly.
- Filtration: Removes old, abnormal, or antibody-coated RBCs; removes particulates, bacteria (esp. encapsulated), and parasitized RBCs
- Immune function: Major site of IgM production; synthesis of properdin (alternate complement pathway activator) and tuftsin (opsonin); antigen presentation
- Hematopoiesis: Fetal hematopoiesis; extramedullary hematopoiesis in disease states
- Pitting: Removes inclusions from RBCs (Howell-Jolly bodies, Heinz bodies, ring forms of malaria) without destroying the cell
- Reservoir: Stores platelets (~30%), RBCs; contracts during stress/exercise to release them
| Mechanism | Example |
|---|---|
| Reactive hyperplasia of lymphoid/RE cells (infection, inflammation) | Malaria, EBV, Kala-azar, SLE |
| Infiltration by abnormal cells | Leukemia, Lymphoma, Storage disorders (Gaucher), Metastasis |
| Extramedullary hematopoiesis | Thalassemia major, Myelofibrosis, hemolytic anemias |
| Congestion (passive) | Portal hypertension (EHPVO, cirrhosis), CCF, Splenic vein thrombosis |
| Work hypertrophy | Hereditary spherocytosis, Autoimmune hemolytic anemia |
| Cysts/Granulomas | Splenic cyst, Echinococcus, Sarcoidosis, TB |
HMS (also called Tropical Splenomegaly Syndrome) is an abnormal immune response to repeated malarial infections — not due to active parasitemia, but due to chronic antigen stimulation leading to uncontrolled B-cell IgM production, immune complex deposition, and RE system hyperplasia causing massive splenomegaly.
Fakunle's Diagnostic Criteria (Major):
- Persistent gross splenomegaly (Hackett Grade III or above)
- Elevated anti-malarial antibodies (high IgG anti-malarial antibody titers)
- Markedly elevated serum IgM (>2 SD above local mean)
- Hepatic sinusoidal lymphocytosis on liver biopsy
- Favorable clinical and serological response to long-term antimalarial prophylaxis
Peripheral smear does NOT show malarial parasites in HMS.
| Fever Pattern | Cause |
|---|---|
| Cyclic, every 48 hours (tertian) | P. vivax / P. falciparum malaria |
| Cyclic, every 72 hours (quartan) | P. malariae malaria |
| Prolonged undulant, no rigors, associated wasting | Kala-azar (Visceral Leishmaniasis) |
| Stepwise fever with relative bradycardia | Typhoid (Enteric fever) |
| Intermittent with night sweats, weight loss | TB, Lymphoma (Pel-Ebstein fever in Hodgkin's) |
| High swinging fever, toxicity | Septicemia, SBE |
| Quotidian (daily spikes), systemic features | Systemic JIA |
- Residence in or travel to an endemic area (Bihar, Jharkhand, West Bengal, Eastern UP in India; also Bangladesh, Nepal)
- Prolonged fever (weeks to months), often with two daily spikes
- Painless, progressive, massive splenomegaly
- Darkening of skin (kala-azar = "black fever" in Hindi) particularly face, hands, feet — post-kala-azar dermal leishmaniasis (PKDL) in treated cases
- Severe wasting despite good appetite initially; progressive malnutrition
- Epistaxis (thrombocytopenia from hypersplenism)
- History of sandfly bite exposure (nocturnal biting habits)
- Onset of pallor and abdominal swelling in early infancy (6–24 months)
- Severe anemia requiring repeated blood transfusions
- Consanguineous parents (autosomal recessive)
- Family history of similar illness in siblings
- Ethnic background (Mediterranean, Middle East, Indian, Chinese)
- Failure to thrive, growth failure, frontal bossing (craniofacial changes)
- No fever (unless intercurrent infection)
- Jaundice (mild chronic hemolytic jaundice possible)
🩺 Examination — Exam Q&A
Patient position: Supine, with hips and knees slightly flexed to relax abdominal muscles. Alternatively, right lateral decubitus position (brings spleen closer to the examiner).
Palpation technique:
- Always start from the right iliac fossa (to avoid missing a massively enlarged spleen)
- Use flat of the right hand, move diagonally towards left upper quadrant with each inspiration
- Feel for the spleen tip as it descends during deep inspiration
- Look for: notch on medial border (pathognomonic), movement with respiration, inability to get above the mass
Percussion:
- Traube's space (bounded by 6th rib superiorly, left mid-axillary line laterally, left costal margin inferiorly) — normally resonant; dullness in Traube's space suggests splenomegaly
- Splenic dullness in the lowest intercostal space in the left anterior axillary line (Nixon's method)
Ballottement: Bimanual technique — left hand below the left loin, right hand palpates anteriorly. The spleen is not ballotable (unlike a renal mass).
| Feature | Splenomegaly | Renal Mass (Left) |
|---|---|---|
| Notch on medial border | Present | Absent |
| Movement with respiration | Obliquely downward and medially | Vertically downward |
| Can get above the mass | Cannot (continuous with left hypochondrium) | Can (ballotable) |
| Ballottement | Not ballotable | Ballotable (bimanual) |
| Traube's space percussion | Dull | Resonant (bowel in front) |
| Location | Superficial to transverse colon | Retroperitoneal; bowel loops in front → resonant |
| Band of colonic resonance | Absent (anterior to spleen) | Present (colon in front of kidney) |
| Grade | Description |
|---|---|
| Grade 0 | Spleen not palpable even on deep inspiration |
| Grade I | Palpable only on deep inspiration; just below LCM |
| Grade II | Palpable on normal inspiration; between LCM and a horizontal line halfway to the umbilicus |
| Grade III | Palpable below a horizontal line halfway between LCM and umbilicus, but not reaching it |
| Grade IV | Reaches or crosses the umbilical line, but not the mid-pubic line |
| Grade V (Massive) | Extends below the mid-pubic line |
💡 Exam Tip
Hackett's grading was originally devised for assessing malarial endemicity (the "spleen rate") in populations. Grade III–V is considered massive splenomegaly in clinical practice.
Traube's space is a crescent-shaped area of tympanic resonance in the left lower anterior thorax, bounded by:
- Superiorly: Lower border of left lung (6th rib)
- Laterally: Left mid-axillary line
- Inferiorly: Left costal margin
It is normally resonant (due to gastric air bubble). Dullness in Traube's space suggests splenomegaly, pleural effusion, or a full stomach. It is a useful screening percussion sign for splenomegaly, especially before palpation.
| Characteristic | Clinical Significance |
|---|---|
| Size (in cm below LCM) | Grade and severity; massive suggests leukemia, kala-azar, HMS, thalassemia |
| Consistency — Soft | Acute infections (EBV, malaria) |
| Consistency — Firm | Hemolytic anemia, HMS, portal hypertension |
| Consistency — Rock hard | Calcification, malignancy, Gaucher disease |
| Tenderness | Acute enlargement (splenic abscess, infarct, acute infection) |
| Surface — Smooth | Most causes |
| Surface — Irregular/nodular | Malignancy, cysts, abscess |
| Notch | Confirms splenic origin of mass |
Hypersplenism is a clinical syndrome where an enlarged spleen excessively destroys/sequesters blood cells, leading to cytopenias, with a compensatory hyperactive bone marrow.
Features of Hypersplenism:
- Splenomegaly (underlying cause)
- Cytopenias: Anemia, leukopenia, thrombocytopenia (any combination; pancytopenia is classic)
- Bone marrow is reactive/hyperplastic (to compensate)
- Correction (improvement in cell counts) after splenectomy
💡 Key Distinction
Hypersplenism = overactive spleen causing blood cell destruction.
Splenomegaly = merely an enlarged spleen (hypersplenism is one complication of splenomegaly, not always present).
| Finding | Suggests |
|---|---|
| Pallor + jaundice + splenomegaly | Hemolytic anemia (thalassemia, spherocytosis) |
| Lymphadenopathy + splenomegaly | Lymphoma, leukemia, EBV, CMV |
| Skin darkening + wasting | Kala-azar |
| Frontal bossing + prominent malar eminences | Thalassemia major (marrow expansion) |
| Hepatomegaly + splenomegaly + jaundice + ascites | Cirrhosis, EHPVO |
| Petechiae/purpura + splenomegaly | Leukemia, ITP with hypersplenism |
| Cherry-red spot (macula) + splenomegaly | Storage disorders (Niemann-Pick, GM1 gangliosidosis) |
| Joint swelling + hepatosplenomegaly + fever | Systemic JIA (Still's disease) |
| Salmon-pink rash + fever + arthritis | Systemic JIA |
| Kayser-Fleischer rings | Wilson's disease |
Pseudo-splenomegaly (visceroptosis) refers to a normal-sized spleen displaced downward from its normal position due to congenital laxity of supporting ligaments or hyperinflation of lungs pushing it down. It may be palpable anywhere from the left upper quadrant to the pelvis.
Differentiating features:
- The spleen can be pushed back under the left costal margin on palpation (this is not possible in true splenomegaly)
- Abdominal X-ray (erect) may show intestinal gas between left dome of diaphragm and the spleen
- Ultrasound confirms normal splenic size
🔬 Investigations — Exam Q&A
First-line (routine) investigations:
- Complete Blood Count (CBC) with differential and peripheral blood smear — most informative initial test
- Reticulocyte count
- Liver function tests (LFT): Bilirubin, SGOT, SGPT, Alkaline phosphatase, Total protein, Albumin, PT
- Urine examination (bile salts, pigments)
- ESR, CRP
- Abdominal Ultrasonography — confirms and quantifies splenomegaly, assesses liver and portal vein
Direct further investigations based on clinical clues from history and examination.
| PBS Finding | Diagnosis |
|---|---|
| Malarial parasites (ring forms, trophozoites) | Malaria |
| Microcytic hypochromic RBCs + target cells + nucleated RBCs | Thalassemia major |
| Sickle cells (irreversible sickle cell forms) | Sickle cell disease |
| Spherocytes (small, dense, no central pallor) | Hereditary spherocytosis, AIHA |
| Blast cells | Acute Leukemia |
| Hypersegmented neutrophils + macro-ovalocytes | Megaloblastic anemia |
| Tear-drop RBCs (dacryocytes) + leukoerythroblastic picture | Myelofibrosis |
| Atypical lymphocytes (Downey cells) | EBV (Infectious Mononucleosis) |
| LE cells | SLE |
| Howell-Jolly bodies (in asplenic state) | Post-splenectomy / functional asplenia |
- rK39 rapid antigen test (immunochromatographic test) — most widely used in field; high sensitivity and specificity in immunocompetent patients
- Direct Agglutination Test (DAT) — high sensitivity and specificity
- ELISA for anti-Leishmania antibodies
- Splenic aspirate microscopy — most sensitive (95-99%) for detecting LD (Leishman-Donovan) bodies; done only in centers with expertise (risk of bleeding)
- Bone marrow aspirate — safer than splenic aspirate; shows LD bodies (amastigotes of Leishmania donovani)
- Aldehyde test (Formol gel test) — non-specific; indicates elevated serum IgG (positive in chronic kala-azar)
- Leishmania PCR — most sensitive; used to monitor treatment response
- CBC: Pancytopenia (anemia + leucopenia + thrombocytopenia)
- Serum: Very high IgG, low albumin, hypoalbuminemia
- Peripheral Blood Smear (PBS): Thick and thin smear — gold standard for diagnosis; identifies species and parasite density. Thick smear is more sensitive; thin smear helps species identification
- Malaria Rapid Diagnostic Tests (RDT): Detect malaria antigen (HRP-2 for P. falciparum; pLDH for all species); quick point-of-care test
- Malaria PCR: Most sensitive; used for low parasitemia and species confirmation
- Serology (ELISA/IFA): Useful in HMS (elevated anti-malarial antibodies); NOT useful for acute malaria
- For HMS: Elevated serum IgM (>2 SD above local mean), elevated anti-malarial antibodies, normal/absent malarial parasites on smear
- CBC: Severe microcytic hypochromic anemia; low MCV, MCH, MCHC
- PBS: Microcytic hypochromic RBCs, target cells, basophilic stippling, polychromasia, nucleated RBCs
- Reticulocyte count: Elevated (compensatory erythropoiesis)
- Hemoglobin Electrophoresis (HPLC): Gold standard; shows elevated HbF and HbA2 in beta-thalassemia major; absent/reduced HbA
- Osmotic Fragility Test: Decreased osmotic fragility in thalassemia (RBCs are resistant)
- Serum Iron studies: Serum iron elevated (due to hemolysis and transfusions), TIBC low, ferritin elevated — iron overload
- Serum Bilirubin: Elevated (indirect) due to hemolysis
- Bone Marrow: Erythroid hyperplasia; ineffective erythropoiesis
- Genetic testing / DNA analysis: Confirms mutation; used for prenatal diagnosis
- X-ray of skull/long bones: Hair-on-end appearance (skull), Erlenmeyer flask deformity (femur)
- Ultrasound abdomen (first choice): Non-invasive, no radiation; confirms splenomegaly, measures splenic dimensions, assesses liver size and echotexture, portal vein diameter, ascites, lymphadenopathy, collaterals
- CT abdomen: Better for splenic focal lesions (abscess, infarct, cyst, tumor), lymphadenopathy; used when US is inconclusive
- MRI: Used for storage disorders (Gaucher disease — MRI of bones and liver shows characteristic changes), lymphoma staging
- Doppler US of portal and splenic veins: Assesses portal hypertension (portal vein diameter > 13 mm, reversed/hepatofugal flow)
- Radionuclide scan (Tc-99m sulfur colloid): Assesses splenic function; only test giving functional information; not routine
Ultrasound is the preferred first-line imaging in children — safe, repeatable, no radiation.
- Suspected leukemia or lymphoma (unexplained cytopenias, blasts on PBS)
- Diagnosis of Kala-azar (safer than splenic aspirate — shows LD bodies)
- Suspected storage disorders (Gaucher — Gaucher cells/macrophages; Niemann-Pick)
- Hemophagocytic Lymphohistiocytosis (HLH) — hemophagocytosis on marrow
- Myelofibrosis (dry tap on aspiration + biopsy shows fibrosis)
- Unexplained pancytopenia with splenomegaly
💊 Management — Exam Q&A
Splenomegaly is a sign, not a disease. Management is directed at the underlying cause. The spleen will often regress once the primary condition is treated.
- Identify and treat the underlying etiology
- Manage complications: anemia (transfusions), hypersplenism, infections
- Advise avoidance of contact sports in significant splenomegaly (risk of rupture)
- Splenectomy is a last resort, with specific indications
- Liposomal Amphotericin B (L-AmB) — Drug of Choice in India for VL; single dose 10 mg/kg IV or 3 mg/kg on days 1–5 + day 10; highly effective (>95%) with low toxicity
- Miltefosine (oral) — first oral drug for VL; 2.5 mg/kg/day for 28 days; teratogenic (avoid in pregnancy/females of child-bearing age)
- Amphotericin B deoxycholate — older option; nephrotoxic
- Meglumine antimoniate / Sodium Stibogluconate (pentavalent antimonials) — previously first-line but now replaced in India due to high resistance (>60% in Bihar)
- Combination therapy: Used in cases of resistance; e.g., L-AmB + Miltefosine
- Supportive: Blood transfusions for severe anemia, nutrition support
- Monitor for treatment response: Reduction in fever and spleen size over weeks
🚨 Key Point
In India (especially Bihar), antimonial resistance is >60%, so Liposomal Amphotericin B is the recommended first-line treatment under the National Kala-azar Elimination Programme.
- Long-term antimalarial prophylaxis is the cornerstone of treatment
- Proguanil (preferred) or Chloroquine given for months to years — leads to reduction in spleen size and IgM levels (confirms diagnosis by therapeutic response)
- Treatment should be continued indefinitely as long as patient is in an endemic area
- Supportive: Treat anemia, manage hypersplenism
- Splenectomy is NOT recommended in HMS (high risk; OPSI post-splenectomy in malarial areas; splenic lymphoma may develop)
Absolute/Strong indications:
- Hereditary spherocytosis — corrects hemolysis; usually deferred until >5 years of age
- Thalassemia major — when transfusion requirement increases markedly (>200–250 mL/kg/year of packed RBCs); reduces transfusion burden; rarely done now with BMT availability
- Sickle cell disease — for recurrent, life-threatening splenic sequestration crises
- Immune Thrombocytopenic Purpura (ITP) — refractory to medical therapy
- Hypersplenism with severe symptomatic cytopenias causing recurrent infections or bleeding
- Splenic abscess, trauma with uncontrolled hemorrhage
- Splenic lymphoma (select cases)
Ideal age for elective splenectomy: After 5–6 years of age (to reduce risk of OPSI).
OPSI = Overwhelming Post-Splenectomy Infection. It is a fulminant, life-threatening sepsis occurring in asplenic (or functionally asplenic) individuals, most commonly due to encapsulated bacteria:
- Streptococcus pneumoniae (most common — ~50%)
- Haemophilus influenzae type b
- Neisseria meningitidis
Asplenic patients cannot opsonize and clear encapsulated organisms effectively. OPSI can rapidly progress to DIC, shock, and death within 24–48 hours.
Prevention of OPSI:
- Vaccinations (give 2 weeks before splenectomy if elective):
- Pneumococcal vaccine (PCV13 + PPSV23)
- Hib vaccine
- Meningococcal vaccine (MCV4)
- Annual Influenza vaccine
- Lifelong penicillin prophylaxis (Amoxicillin/Penicillin V oral) — especially in first 5 years post-splenectomy and in children under 16 years; recommended in sickle cell disease lifelong
- Patient/parent education: Seek prompt medical care for fever; carry penicillin for emergency use
- Medical alert bracelet/card
Splenic sequestration crisis is an acute, life-threatening emergency in sickle cell disease (also in compound HbS-β-thalassemia) where a large proportion of the total blood volume becomes suddenly trapped within the spleen due to venous occlusion by sickled cells, causing rapid, severe drop in hemoglobin leading to hypovolemic shock.
Features:
- Rapidly enlarging, tender spleen
- Sudden, profound anemia (Hb may drop by >2 g/dL from baseline in hours)
- Hypovolemic shock (tachycardia, hypotension, altered sensorium)
- Predominantly in children <5 years with SCD (before autosplenectomy)
Management:
- Emergency blood transfusion — 10 mL/kg packed RBCs; may need repeat transfusion
- IV fluids for volume resuscitation
- Oxygen
- Monitor: Hb, spleen size, hemodynamics
- Note: Spleen size regresses after transfusion as blood re-enters circulation
- Long-term: Prophylactic transfusion program or splenectomy after recurrence
- Hypersplenism: Cytopenias — anemia, thrombocytopenia (bleeding risk), leucopenia (infection risk)
- Spontaneous/traumatic rupture: Especially in EBV (mononucleosis), malaria, trauma — surgical emergency
- Splenic infarction: Sudden severe LUQ pain; seen in sickle cell, leukemia, thromboembolic disease
- Peritonitis: From splenic abscess or infarct
- Abdominal discomfort and early satiety from massive enlargement
- Splenic vein thrombosis: Can cause isolated gastric varices
🔭 Recent Advances — Exam Q&A
- Single-dose Liposomal Amphotericin B (10 mg/kg): WHO and India's National Programme have endorsed single-dose L-AmB as first-line treatment; high cure rates (>95%), low toxicity, treatment compliance improved dramatically
- Miltefosine: First oral drug for VL; improved access in rural areas; however emerging drug resistance is a concern
- Combination therapy: WHO recommends L-AmB + Miltefosine or L-AmB + Paromomycin to reduce drug resistance and treatment duration
- Paromomycin: Injectable aminoglycoside effective against VL; used in combination regimens; cheaper alternative
- rK39 and rK28 ICT strips: Point-of-care diagnostics improving field diagnosis, especially in sub-Saharan Africa
- PCR for treatment monitoring: Used to detect minimal residual disease and predict relapse
- Thalassemia major: Allogeneic HSCT from an HLA-matched sibling is the only curative treatment; best outcomes when done early (Pesaro Class I — no hepatomegaly, no portal fibrosis, regular chelation); 5-year event-free survival ~90% in Class I
- Sickle cell disease: Allogeneic HSCT is increasingly used; gene therapy trials are advancing
- Gene therapy: Ex vivo lentiviral gene addition and CRISPR-Cas9-based gene editing (induction of fetal hemoglobin) are in advanced clinical trials for both thalassemia and SCD; Betibeglogene Autologous gene therapy (Zynteglo) is FDA-approved for transfusion-dependent beta-thalassemia
HLH is a life-threatening syndrome of excessive immune activation where activated macrophages and cytotoxic T-cells engulf and destroy blood cells — causing a cytokine storm.
HLH diagnostic criteria (HLH-2004, ≥5 of 8):
- Fever ≥38.5°C
- Splenomegaly
- Cytopenias (≥2 cell lines): Hb <9 g/dL, platelets <100,000, neutrophils <1000
- Hypertriglyceridemia and/or hypofibrinogenemia
- Hemophagocytosis on bone marrow/spleen/lymph node biopsy
- Low/absent NK cell activity
- Elevated ferritin (>500 ng/mL; >10,000 ng/mL strongly suggestive)
- Elevated soluble CD25 (sIL-2Rα) >2400 U/mL
Treatment: HLH-2004 protocol — Dexamethasone + Etoposide ± Cyclosporine, followed by HSCT in familial/primary HLH
PSE is a minimally invasive interventional radiology procedure where 30–70% of the spleen's blood supply is blocked by catheter-delivered embolic particles to reduce splenic size and hypersplenism, while preserving the remaining immune function of the spleen.
- Indications: Hypersplenism with significant cytopenias (especially thrombocytopenia causing bleeding), where full splenectomy carries high risk; used in cirrhosis/portal hypertension as an alternative to splenectomy; also used preoperatively to reduce size and blood loss in large splenomegaly
- Advantages: Preserves some splenic immune function (unlike total splenectomy); avoids surgical risk
- Complications: Post-embolization syndrome (fever, pain, pleural effusion), splenic abscess, re-enlargement
Gaucher disease is the most common lysosomal storage disorder — autosomal recessive deficiency of glucocerebrosidase (acid β-glucosidase), causing accumulation of glucocerebroside in macrophages of the RES (spleen, liver, bone marrow).
- Typically presents with massive splenomegaly + hepatomegaly + bone disease (pathological fractures, bone pain, "Erlenmeyer flask" deformity) + pancytopenia
- Gaucher cells (distended macrophages with "crumpled tissue paper" cytoplasm) seen on bone marrow biopsy
- Diagnosis: Low leucocyte glucocerebrosidase activity + elevated plasma chitotriosidase; DNA mutation analysis
- Treatment: Enzyme Replacement Therapy (ERT) with Imiglucerase/Velaglucerase — dramatically reduces spleen size and cytopenias; substrate reduction therapy (Miglustat/Eliglustat) for those intolerant to ERT
⚡ Key Points — Quick Revision
One-Liners for Exam
- Most common overall cause of splenomegaly in children: Infections (especially viral)
- Most common cause of massive splenomegaly: CML (adults); Kala-azar / Thalassemia / HMS (Indian children)
- Splenomegaly in a child is palpable when: >2 cm below left costal margin
- Palpable spleen in normal newborn: Up to 30% (physiological)
- Hackett's Grade V: Spleen crossing mid-pubic line = massive
- Traube's space dullness: Suggests splenomegaly
- Distinguish spleen from kidney: Notch + non-ballotable + moves obliquely + dull Traube's space
- Hypersplenism triad: Splenomegaly + Pancytopenia + Hyperactive bone marrow
- Functional asplenia in sickle cell: Autosplenectomy by repeated infarcts; Howell-Jolly bodies on PBS
- OPSI organisms: Pneumococcus (most common), H. influenzae, Meningococcus
- Kala-azar DOC in India: Single-dose Liposomal Amphotericin B
- HMS treatment: Long-term antimalarial prophylaxis (Proguanil/Chloroquine)
- Gaucher disease: Glucocerebrosidase deficiency; crumpled tissue paper cells; treat with ERT (Imiglucerase)
- HLH: Ferritin >10,000 strongly suggestive; treat with Dexamethasone + Etoposide
- Thalassemia cure: HSCT / Gene therapy (Zynteglo)
- Splenic sequestration crisis: Emergency in SCD; treat with blood transfusion + IV fluids
- Splenectomy deferred until: >5 years (reduce OPSI risk)
- Pre-splenectomy vaccines: Pneumococcal, Hib, Meningococcal — 2 weeks before elective splenectomy
- Gold standard imaging: Ultrasound abdomen (no radiation, repeatable)
- Splenic rupture risk: Highest in EBV/mononucleosis — avoid contact sports
💡 Important Differentials at a Glance
| Feature | Kala-azar | Malaria | Thalassemia | Leukemia |
|---|---|---|---|---|
| Age | Any (5-15 common) | Any | <2 years onset | Any |
| Fever | Prolonged, non-cyclic | Cyclic, rigors | Absent (unless infection) | Irregular |
| Spleen size | Massive | Moderate–massive | Massive | Moderate–large |
| Liver | Enlarged | Enlarged | Enlarged | Enlarged |
| Lymphadenopathy | Absent | Absent | Absent | Present |
| Jaundice | Absent | Present | Mild (chronic) | Absent usually |
| Skin changes | Darkening | Pallor ± jaundice | Frontal bossing | Pallor, petechiae |
| PBS | Pancytopenia; no parasite | Malarial parasites | Microcytic hypochromic | Blast cells |
| Diagnostic test | rK39 / bone marrow | PBS / RDT | Hb electrophoresis (HPLC) | Bone marrow biopsy |