## Clinical and Laboratory Features of Kala-azar ### Hepatosplenomegaly **Key Point:** Hepatosplenomegaly is present in >90% of kala-azar cases and is often massive, with the spleen sometimes extending 10–15 cm below the costal margin. **Clinical Pearl:** The splenomegaly is typically firm, non-tender, and may be the most prominent clinical finding. ### Hematologic Abnormalities | Finding | Mechanism | Clinical Significance | |---------|-----------|----------------------| | Pancytopenia | Bone marrow infiltration by infected macrophages + splenic sequestration | Anemia, bleeding tendency, infections | | Thrombocytopenia | Splenic sequestration and bone marrow involvement | Bleeding manifestations | | Leukopenia | Bone marrow infiltration and splenic pooling | Increased infection risk | | Hemolytic anemia | Splenic destruction of RBCs + marrow suppression | Pallor, jaundice | **High-Yield:** Pancytopenia is the rule in kala-azar, NOT thrombocytosis. Platelet counts are typically low (often <100,000/μL), not elevated. ### Immunologic Features **Key Point:** Hypergammaglobulinemia with markedly elevated IgG levels is a hallmark of visceral leishmaniasis, reflecting the chronic antigenic stimulation by the parasite. **Mnemonic:** **KALA** = **K**ala-azar, **A**nemia, **L**ow platelets, **A**ltered immunity ### Why Option 4 is Incorrect Thrombocytosis (elevated platelet count) does NOT occur in kala-azar. Instead, thrombocytopenia (low platelet count) is characteristic. This is a critical distinction for exam purposes — students often confuse the direction of the platelet abnormality.
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