Orris

Causes of splenomegaly

Reading File
Finding Sources
Finding Sources
Reading File
Reading File
Reading File
I now have comprehensive information from two authoritative sources. Here is a structured overview of the causes of splenomegaly:

Causes of Splenomegaly

The spleen enlarges whenever it is called upon to perform increased work — as a filter, immune organ, or site of extramedullary hematopoiesis — or when congested by venous outflow obstruction.

1. Infections

The most common category overall. Geography and travel history are key clues.
Bacterial
  • Infective endocarditis (especially subacute)
  • Tuberculosis
  • Typhoid fever
  • Brucellosis
  • Syphilis
  • Rocky Mountain spotted fever
Viral
  • Infectious mononucleosis (EBV) — classic cause in young adults
  • HIV
  • Cytomegalovirus (CMV)
Fungal / Protozoal / Parasitic
  • Malaria (one of the most common worldwide causes; can cause massive splenomegaly)
  • Leishmaniasis / Kala-azar (visceral leishmaniasis — a cause of massive splenomegaly in endemic areas)
  • Histoplasmosis
  • Toxoplasmosis
  • Schistosomiasis
  • Trypanosomiasis
  • Echinococcosis

2. Congestive (Portal Hypertension)

Obstruction of venous outflow raises pressure in the splenic sinusoids.
  • Cirrhosis — the most common cause of massive congestive splenomegaly
  • Schistosomiasis — "pipestem" hepatic fibrosis causes particularly severe congestive enlargement
  • Portal or splenic vein thrombosis
  • Congestive cardiac failure (right-sided: tricuspid/pulmonic disease, cor pulmonale)
Note: Systemic/cardiac congestion produces only moderate enlargement (rarely >500 g), while cirrhosis and portal vein obstruction can cause massive enlargement.

3. Lymphohematogenous (Malignant) Disorders

  • Hodgkin lymphoma
  • Non-Hodgkin lymphomas / lymphocytic leukemias (CLL, hairy cell leukemia)
  • Acute leukemias (ALL, AML)
  • Chronic myeloid leukemia (CML) — classic cause of massive splenomegaly
  • Multiple myeloma
  • Myeloproliferative neoplasms (polycythemia vera, myelofibrosis — the latter causes the largest spleens)
  • Metastatic solid tumors (less common)

4. Immune-Mediated / Autoimmune

  • Rheumatoid arthritis (Felty syndrome: RA + splenomegaly + neutropenia)
  • Systemic lupus erythematosus (SLE)
  • Autoimmune hemolytic anemia
  • Drug reactions (e.g., phenytoin)

5. Non-Malignant Hematologic Disorders

These cause splenomegaly through increased red cell destruction or extramedullary haematopoiesis.
  • Hereditary spherocytosis
  • Thalassaemia major / haemoglobinopathies (sickle cell disease — early; later undergoes autosplenectomy)
  • Other congenital or acquired haemolytic anaemias
  • Extramedullary haematopoiesis (myelofibrosis, severe anaemia)

6. Storage Diseases and Infiltrative Disorders

  • Gaucher disease — most common lysosomal storage disease; classic cause of massive splenomegaly
  • Niemann-Pick disease
  • Sarcoidosis
  • Amyloidosis
  • Thyrotoxicosis (uncommon)
  • Hemophagocytic lymphohistiocytosis (HLH)

7. Structural / Vascular

  • Splenic cysts (true cysts vs. pseudocysts)
  • Splenic abscess
  • Splenic artery aneurysm

Key Clinical Points

FeatureSignificance
Massive splenomegaly (>1 kg)CML, myelofibrosis, malaria, Gaucher disease, portal hypertension (cirrhosis/schistosomiasis), hairy cell leukemia
HypersplenismAny cause of splenomegaly can produce anaemia, leukopenia, and thrombocytopenia via sequestration
Acute splenitisAny blood-borne bacterial infection; spleen is soft, congested, 200–400 g
Geography mattersMalaria, leishmaniasis, and schistosomiasis dominate in tropical/endemic regions
— Robbins, Cotran & Kumar Pathologic Basis of Disease, Table 13.12; Goldman-Cecil Medicine, Table 154-5
This is a shared conversation. Sign in to Orris to start your own chat.