Blood & Lymphoreticular

Splenomegaly, hypersplenism, and splenectomy complications

Clinical Overview and When to Suspect Splenomegaly / Hypersplenism

The spleen normally weighs ~150 g and is not palpable. Splenomegaly = splenic enlargement beyond normal; hypersplenism = functional consequence of splenomegaly → excessive sequestration/destruction of blood cells → cytopenias.

— LUQ fullness, early satiety, left shoulder pain (Kehr sign if capsule stretch/infarct)

— Peripheral smear shows cytopenias out of proportion to marrow production

— Incidental finding on abdominal imaging

Board pearl: A palpable spleen tip is always abnormal in adults — a spleen must be ~2–3× normal size before it becomes palpable on exam.

Classic patient: unexplained cytopenias (especially thrombocytopenia) + palpable left upper quadrant mass ± early satiety

Suspect when:

Hypersplenism triad: splenomegaly + cytopenias (any or all lines) + correction after splenectomy

Normal or hyperplastic bone marrow distinguishes hypersplenism from primary marrow failure

Presentation Patterns and Key History Findings

Symptoms of splenomegaly:

Critical history clues:

Key distinction: Massive splenomegaly (spleen crossing midline or into pelvis) narrows the differential → CML, myelofibrosis, hairy cell leukemia, visceral leishmaniasis, malaria, Gaucher disease.

LUQ pain/fullness, early satiety, referred left shoulder pain

Constitutional symptoms (fevers, night sweats, weight loss) → suggest lymphoma, leukemia, or infection

Symptoms of cytopenias: fatigue (anemia), easy bruising/petechiae (thrombocytopenia), recurrent infections (leukopenia)

Chronic liver disease / portal hypertension → congestive splenomegaly (most common cause in the US)

Travel history → malaria (most common cause worldwide), visceral leishmaniasis, schistosomiasis

Hematologic disorders → hereditary spherocytosis, thalassemia, sickle cell (early childhood before autosplenectomy)

Infectious mononucleosis → splenomegaly with risk of splenic rupture

B symptoms → lymphoma, leukemia

Autoimmune history → SLE, rheumatoid arthritis (Felty syndrome: RA + splenomegaly + neutropenia)

Physical Exam Maneuvers and Signs

Palpation technique:

Percussion:

Associated exam findings:

Board pearl: Spleen is palpable in only ~60% of splenomegaly cases — imaging (US or CT) is more sensitive than physical exam.

Begin in right lower quadrant, advance toward left costal margin with inspiration

Spleen enlarges toward RLQ (unlike kidney which enlarges inferiorly)

A splenic notch on the medial border is pathognomonic for spleen (distinguishes from left kidney)

Traube space (left 6th rib to left costal margin, between anterior axillary and midaxillary lines) — normally tympanitic

Dullness over Traube space suggests splenomegaly (especially in absence of full stomach)

Castell sign: percussion at lowest intercostal space in left anterior axillary line — dullness on full inspiration suggests splenomegaly

Hepatomegaly, ascites, spider angiomata → portal hypertension/cirrhosis

Lymphadenopathy → lymphoma, CLL, infection

Petechiae/purpura → thrombocytopenia from hypersplenism

Pallor → anemia

Jaundice → hemolytic anemia or liver disease

Diagnostic Workup — Laboratory Studies

Initial labs:

— Pancytopenia or isolated cytopenia (thrombocytopenia most common in hypersplenism)

— Smear: target cells, spherocytes, Howell-Jolly bodies (normally removed by functional spleen — their presence suggests hyposplenia, NOT hypersplenism)

— Teardrop cells → myelofibrosis

— Hairy cells → hairy cell leukemia

— Smudge cells → CLL

— Atypical lymphocytes → EBV mononucleosis

Advanced labs (directed by clinical suspicion):

Next best step: Peripheral blood smear is the single most informative test in evaluating splenomegaly with cytopenias.

CBC with differential and peripheral smear — cornerstone

Reticulocyte count → ↑ suggests hemolysis

LDH, haptoglobin, indirect bilirubin, direct Coombs → hemolysis workup

Liver function tests, albumin, INR → assess for cirrhosis

Peripheral smear morphology:

Flow cytometry → lymphoproliferative disorders

JAK2 mutation → myeloproliferative neoplasms

Thick/thin blood smears → malaria

ANA, complement, RF → autoimmune causes

Diagnostic Workup — Imaging and Tissue Diagnosis

Imaging:

— Splenic infarcts, abscess, masses

— Lymphadenopathy assessment

— Portal/splenic vein thrombosis

Tissue diagnosis:

— Myeloproliferative/myelodysplastic disorder suspected

— Unexplained cytopenias despite workup

— Hairy cell leukemia, lymphoma staging

— Infiltrative disorders (Gaucher, amyloid)

Board pearl: Never biopsy the spleen percutaneously as a first-line diagnostic maneuver — bleeding risk is prohibitive. Use peripheral blood, marrow, or lymph node first.

Abdominal ultrasound — first-line; confirms splenomegaly (>13 cm in craniocaudal length), evaluates portal vein and liver

CT abdomen with contrast — better for:

Doppler US — evaluates splenic/portal vein flow when portal hypertension suspected

PET/CT — if lymphoma suspected

Splenic biopsy is generally avoided due to high bleeding risk

Bone marrow biopsy — indicated when:

Lymph node biopsy (excisional preferred) — if lymphadenopathy present and lymphoma suspected

Splenectomy itself may be both diagnostic and therapeutic in select cases (e.g., isolated splenic lymphoma)

Etiologic Classification — A Framework for Management

Congestive (↑ portal pressure):

Infiltrative:

Infectious:

Hematologic — red cell disorders:

Hematologic — white cell / marrow:

Immunologic:

Management logic: Treat the underlying cause first → splenectomy reserved for refractory cytopenias, diagnostic uncertainty, or specific indications (hereditary spherocytosis, ITP refractory to medical therapy, hairy cell leukemia unresponsive to cladribine).

Key distinction: Congestive splenomegaly from cirrhosis → manage portal HTN (TIPS, beta-blockers), NOT splenectomy.

Cirrhosis (most common cause in US), portal/splenic vein thrombosis, Budd-Chiari, CHF

Gaucher disease, Niemann-Pick, amyloidosis, sarcoidosis

EBV (mononucleosis), HIV, malaria, endocarditis, TB, visceral leishmaniasis

Hereditary spherocytosis, thalassemia major, autoimmune hemolytic anemia (AIHA)

CML, myelofibrosis, hairy cell leukemia, CLL, lymphomas

SLE, Felty syndrome, sarcoidosis, serum sickness

First-Line Management by Etiology

Next best step: Always attempt medical management of the underlying cause before considering splenectomy — surgery carries lifelong immunologic consequences.

Portal hypertension → non-selective beta-blockers, TIPS if refractory; address liver disease

AIHA → corticosteroids first-line → rituximab → splenectomy if refractory

Hereditary spherocytosis → folic acid supplementation; splenectomy if moderate-severe hemolysis (preferably after age 5–6; partial splenectomy in young children)

ITP → observation if mild; corticosteroids, IVIG for active bleeding/very low platelets → splenectomy for chronic refractory ITP

Hairy cell leukemia → cladribine (2-CdA) first-line; splenectomy if drug-refractory

CML → tyrosine kinase inhibitors (imatinib) → splenomegaly resolves with treatment

Myelofibrosis → ruxolitinib (JAK2 inhibitor) reduces spleen size; splenectomy rarely indicated due to high surgical risk

EBV mononucleosis → supportive care; avoid contact sports for ≥3–4 weeks (splenic rupture risk)

Indications for and Approach to Splenectomy

Established indications:

Pre-splenectomy checklist — critical board topic:

— Pneumococcal (PCV20 or PCV15 → PPSV23)

— Meningococcal (MenACWY + MenB)

— Haemophilus influenzae type b (Hib)

Surgical approach:

Board pearl: Failure to vaccinate before splenectomy is a patient safety violation — overwhelming post-splenectomy infection (OPSI) carries >50% mortality.

Hereditary spherocytosis with significant hemolysis

Chronic ITP refractory to corticosteroids, rituximab, and TPO-receptor agonists

Splenic sequestration crisis (sickle cell disease)

Splenic abscess not amenable to drainage

Traumatic splenic injury (hemodynamically unstable)

Diagnostic splenectomy for isolated splenic pathology

Vaccinations ≥2 weeks before elective splenectomy:

If emergent splenectomy → vaccinate ≥2 weeks post-operatively

Laparoscopic preferred for non-massive spleens

Open splenectomy for massive splenomegaly or trauma

Partial splenectomy in young children (preserve immune function)

Special Populations — Pediatric Considerations

— Acute splenic sequestration crisis (rapid splenic enlargement + ↓ Hb ≥2 g/dL) → emergent transfusion; consider splenectomy after stabilization

Key distinction: In sickle cell children with fever and functional asplenia, treat empirically with ceftriaxone for encapsulated organisms — do not wait for culture results.

Sickle cell disease: functional autosplenectomy by age 5 due to repeated infarction → Howell-Jolly bodies on smear confirm hyposplenia

Hereditary spherocytosis: delay splenectomy until age >5–6 years to reduce OPSI risk; consider partial splenectomy in younger children

EBV mononucleosis: common in adolescents; splenomegaly in ~50%; splenic rupture is rare but potentially fatal → avoid contact sports for 3–4 weeks

Storage diseases (Gaucher): enzyme replacement therapy (imiglucerase) reduces spleen size → splenectomy now rarely needed

Thalassemia major: chronic hemolysis → massive splenomegaly; splenectomy if transfusion requirements increase significantly (>200–220 mL/kg/year of pRBCs)

Special Populations — Pregnancy, Elderly, Hepatic/Renal Impairment

Pregnancy:

Elderly:

Hepatic impairment:

Renal impairment:

Splenomegaly differential includes HELLP syndrome, acute fatty liver of pregnancy

ITP in pregnancy: corticosteroids and IVIG are safe; splenectomy reserved for 2nd trimester if refractory

Avoid live vaccines pre-splenectomy in pregnant patients

Higher prevalence of hematologic malignancies (CLL, lymphoma, myelofibrosis) as cause of splenomegaly

Surgical risk is higher → favor medical management when possible

Vigilance for post-splenectomy thrombocytosis → thrombosis risk ↑ in elderly

Portal hypertension is the most common cause of splenomegaly with cirrhosis

Thrombocytopenia in cirrhosis is multifactorial: hypersplenism + ↓ thrombopoietin (TPO) production by liver + marrow suppression (alcohol, HCV)

Splenectomy in cirrhotics carries high perioperative morbidity → partial splenic embolization or TPO-receptor agonists (avatrombopag, lusutrombopag) preferred for procedural platelet support

SLE nephritis may present with splenomegaly + cytopenias → treat underlying lupus

Post-transplant lymphoproliferative disorder (PTLD) can cause splenomegaly in renal transplant recipients

Complications of Hypersplenism and Splenic Emergencies

Hypersplenism complications:

Splenic emergencies:

— Traumatic (most common overall) vs atraumatic (EBV mono, hematologic malignancy, malaria)

— Presentation: LUQ pain, Kehr sign (referred left shoulder pain from diaphragmatic irritation), hemodynamic instability

— Next best step in unstable patient: emergent splenectomy

— Stable patient with low-grade splenic injury → observation, serial imaging, bed rest

— Embolic (endocarditis, AF) or thrombotic (myeloproliferative neoplasms, sickle cell)

— Acute LUQ pain, ↑ LDH, wedge-shaped hypodensity on CT

— Management: pain control, treat underlying cause; rarely requires splenectomy

— Endocarditis, hematogenous seeding, contiguous spread

— CT-guided drainage or splenectomy

Board pearl: Atraumatic splenic rupture in a young patient with pharyngitis and atypical lymphocytes = EBV mononucleosis until proven otherwise.

Thrombocytopenia → bleeding risk (though counts rarely <20,000 from hypersplenism alone)

Anemia → symptomatic fatigue, exertional dyspnea; transfuse per clinical need

Leukopenia → increased infection risk

Splenic rupture:

Splenic infarction:

Splenic abscess:

Post-Splenectomy Complications — Immediate and Long-Term

Immediate (perioperative):

— Platelets >1,000,000 → consider low-dose aspirin

— Rarely requires cytoreduction unless very symptomatic or >1.5 million

— ↑ Risk due to thrombocytosis + stasis + endothelial injury

— Fever, abdominal pain, ↑ WBC post-op → CT with contrast

— Treatment: anticoagulation

Long-term:

— Encapsulated organisms: Streptococcus pneumoniae (#1), Neisseria meningitidis, Haemophilus influenzae type b

— Also: Capnocytophaga canimorsus (dog/cat bite), Babesia (tick-borne)

— Risk is lifelong but highest in first 2 years

— Mortality >50% once established → prevention is paramount

Board pearl: Post-splenectomy thrombocytosis is reactive (not clonal) — treat with aspirin, not hydroxyurea, unless extreme.

Hemorrhage, pancreatic tail injury (anatomic proximity), thrombocytosis

Reactive thrombocytosis: platelet count rises within days, peaks 1–3 weeks post-op

Post-splenectomy portal/splenic vein thrombosis:

Overwhelming post-splenectomy infection (OPSI) — most feared complication

Key Differentials — Splenomegaly with Pancytopenia

When splenomegaly + pancytopenia coexist:

Key distinction: Aplastic anemia does NOT cause splenomegaly — if both pancytopenia and splenomegaly are present, think hypersplenism, marrow infiltration, or hairy cell leukemia rather than aplastic anemia.

Next best step: Bone marrow biopsy differentiates these entities when peripheral smear is inconclusive.

Hypersplenism (any cause) → marrow is hyperplastic (trying to compensate)

Myelofibrosis → teardrop cells, leukoerythroblastic smear, dry tap on marrow aspiration

Hairy cell leukemia → pancytopenia + splenomegaly + monocytopenia (classic); "fried egg" cells on smear; TRAP stain positive

Aplastic anemia → pancytopenia but spleen is NOT enlarged; hypocellular marrow

Myelodysplastic syndrome → dysplastic cells on smear; spleen often normal or mildly enlarged

Visceral leishmaniasis (kala-azar) → massive splenomegaly + pancytopenia + fever in traveler from endemic area

Key Differentials — LUQ Mass and Splenic vs Non-Splenic

Differentiating splenomegaly from other LUQ masses:

Splenic lesions found on imaging:

Board pearl: An incidental splenic lesion in a patient with known malignancy should prompt further characterization (CT, PET) rather than observation.

Spleen: moves with respiration, has a medial notch, cannot get above it on palpation, extends toward RLQ

Left kidney: bimanually ballottable, does not have a notch, can get above the mass, moves inferiorly

Pancreatic pseudocyst: epigastric/LUQ, history of pancreatitis, does not move with respiration

Gastric mass: epigastric, associated dysphagia/weight loss

Splenic flexure colon mass: altered bowel habits

Splenic cyst → usually congenital or post-traumatic; observation if small and asymptomatic

Splenic hemangioma → most common benign neoplasm of the spleen; usually incidental

Splenic lymphoma → suspect if B symptoms, FDG-avid on PET

Splenic metastases → rare; melanoma, breast, lung

Preventive Care and Vaccination Strategy for Asplenic Patients

Vaccination — the single most important preventive measure:

— PCV20 (or PCV15 followed by PPSV23 ≥8 weeks later)

— Revaccinate PPSV23 once after 5 years

— MenACWY: 2-dose primary series → boost every 5 years

— MenB: 2- or 3-dose series

Antibiotic prophylaxis:

Patient education:

Next best step for any febrile asplenic patient: Blood cultures + empiric IV ceftriaxone immediately — do NOT wait for results.

Pneumococcal:

Meningococcal:

Hib: single dose if not previously vaccinated

Influenza: annually (reduces secondary bacterial infection risk)

Children <5 years: daily penicillin V prophylaxis until at least age 5

Adults: prophylactic antibiotics are controversial; recommended by some experts for the first 1–2 years post-splenectomy

Standby antibiotics: all asplenic patients should carry amoxicillin-clavulanate or a fluoroquinolone to self-administer at first sign of fever if unable to access emergency care immediately

Wear medical alert bracelet/carry card indicating asplenic status

Seek immediate medical attention for any fever ≥38.3°C (101°F)

Avoid tick-endemic areas (Babesia risk); use tick precautions

Caution with dog/cat bites (Capnocytophaga canimorsus)

Follow-Up and Monitoring After Splenectomy

— Expect ↑ platelet count (reactive thrombocytosis peaks 1–3 weeks)

— Expect ↑ WBC (transient leukocytosis)

— Howell-Jolly bodies (nuclear remnants in RBCs — hallmark of asplenia)

— Target cells

— Pappenheimer bodies (iron granules)

— Mild thrombocytosis

— Occasional nucleated RBCs

— Annual CBC to monitor cytopenias resolution

— Lifelong education about infection risk

— Revaccination per schedule

Board pearl: Howell-Jolly bodies on peripheral smear confirm functional asplenia — their absence post-splenectomy suggests residual splenic tissue (accessory spleen).

CBC at 1–2 weeks post-splenectomy:

Peripheral smear post-splenectomy findings (expected, NOT pathologic):

Monitor for portal/splenic vein thrombosis in first 30 days → CT if new abdominal pain or fever

Verify vaccination status at every encounter

Screen for accessory splenic tissue (splenosis) if disease recurrence post-splenectomy (e.g., ITP relapse) — nuclear medicine heat-damaged RBC scan

Long-term:

Ethical, Legal, and Patient Safety Considerations

— Lifelong increased risk of infection from encapsulated organisms

— Need for vaccinations, potentially prophylactic antibiotics

— Reactive thrombocytosis and thrombotic risk

— Need for medical alert identification

— Document vaccination status in pre-op checklist

— Systems-based approach: institutional protocols to flag asplenic patients for vaccinations

— Ensure primary care provider is aware of asplenic status

— Emergency department visits for fever must trigger rapid empiric antibiotics — institutional protocols should flag asplenic patients

— Splenic preservation (observation, angioembolization) preferred when hemodynamically stable

— Non-operative management in children is standard unless hemodynamic instability persists

Key distinction: Over-reliance on observation in hemodynamically unstable splenic trauma is dangerous — emergent splenectomy is life-saving and should not be delayed.

Informed consent for splenectomy must include:

Failure to vaccinate prior to elective splenectomy constitutes a preventable medical error

Transitions of care:

In trauma settings:

High-Yield Associations and Rapid-Fire Clinical Facts

Board pearl: If a post-splenectomy patient develops sepsis from a dog bite → think Capnocytophaga canimorsus.

Massive splenomegaly → CML, myelofibrosis, hairy cell leukemia, malaria, Gaucher disease, visceral leishmaniasis

Howell-Jolly bodies → functional asplenia (sickle cell) or post-splenectomy

Monocytopenia + splenomegaly → hairy cell leukemia

Teardrop cells + leukoerythroblastic smear → myelofibrosis

Felty syndrome → RA + splenomegaly + neutropenia

Target cells on smear → liver disease, thalassemia, HbC, post-splenectomy

Kehr sign → left shoulder pain from diaphragmatic irritation (splenic rupture/infarct)

OPSI → Streptococcus pneumoniae is the #1 organism

Capnocytophaga canimorsus → sepsis after dog bite in asplenic patient

Babesia → intraerythrocytic parasite on smear ("Maltese cross"); severe in asplenic patients

Sickle cell + fever in child <5 → empiric ceftriaxone (functional asplenia)

EBV mono + contact sports → splenic rupture risk

Thrombocytopenia from hypersplenism rarely drops below 20,000–30,000/µL

Dry tap on bone marrow aspiration → myelofibrosis (do trephine biopsy)

Board Question Stem Patterns

45M, cirrhosis, platelet count 65,000, spleen 16 cm on US → Hypersplenism from portal hypertension → manage liver disease; no splenectomy

Young patient, sore throat, fatigue, atypical lymphocytes, splenomegaly → EBV mononucleosis → avoid contact sports 3–4 weeks; supportive care

Post-splenectomy patient, fever 39°C, tachycardia → Blood cultures + empiric IV ceftriaxone immediately

CBC: pancytopenia + splenomegaly + monocytopenia → Hairy cell leukemia → TRAP stain, flow cytometry → cladribine

Peripheral smear shows Howell-Jolly bodies in a 7-year-old with sickle cell → Functional asplenia → ensure vaccinations, daily penicillin prophylaxis

50F, ITP refractory to steroids and rituximab → Splenectomy → vaccinate ≥2 weeks before surgery

Teardrop cells + nucleated RBCs + dry tap → Myelofibrosis → JAK2 mutation testing

Post-splenectomy day 7, platelets 900,000 → Reactive thrombocytosis → low-dose aspirin; no cytoreduction unless symptomatic

Asplenic patient bitten by dog, develops fulminant sepsis → Capnocytophaga canimorsus

Traveler from Sudan, massive splenomegaly + pancytopenia + fever → Visceral leishmaniasis (kala-azar) → rK39 antigen test, bone marrow for Leishman-Donovan bodies

One-Line Recap

Splenomegaly has a broad differential (congestive, infiltrative, infectious, hematologic, immunologic) best evaluated with peripheral blood smear, CBC, and abdominal ultrasound; hypersplenism is the functional consequence causing cytopenias (especially thrombocytopenia) with a hyperplastic marrow; management targets the underlying etiology with splenectomy reserved for refractory cases; the most critical post-splenectomy concern is overwhelming post-splenectomy infection (OPSI) by encapsulated organisms (S. pneumoniae #1), prevented by pre-splenectomy vaccination (pneumococcal, meningococcal, Hib), patient education, medical alert identification, and empiric IV ceftriaxone at the first sign of fever in any asplenic patient — a principle that applies equally to surgical asplenia and functional asplenia (sickle cell disease).

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Blood & Lymphoreticular