A 5-year-old girl from Kerala with β-thalassemia intermedia is being evaluated. Which of the following statements about thalassemia intermedia is NOT correct?

Question

Accepted Answer

B. Splenomegaly is usually absent or mild, unlike thalassemia major. ## Thalassemia Intermedia: Clinical and Pathologic Features

### Definition and Severity Spectrum

Thalassemia intermedia occupies the middle ground between thalassemia trait (asymptomatic) and thalassemia major (transfusion-dependent):
- **Hemoglobin level:** 7–10 g/dL (moderate anemia)
- **Transfusion requirement:** Minimal or none (unlike major)
- **Clinical severity:** Variable; depends on genotype and degree of β-globin chain deficit

### Pathophysiology

| Mechanism | Contribution to Anemia |
|-----------|------------------------|
| **Ineffective erythropoiesis** | Intramedullary hemolysis of abnormal RBC precursors |
| **Hemolysis** | Circulating RBC destruction (shorter RBC lifespan) |
| **Imbalanced globin chains** | Excess α chains precipitate, causing oxidative damage |

**High-Yield:** Both ineffective erythropoiesis AND hemolysis contribute to anemia in thalassemia intermedia, making it more severe than trait but less severe than major.

### Splenomegaly in Thalassemia Intermedia

**Key Point:** Splenomegaly in thalassemia intermedia is **MARKED and SIGNIFICANT**, NOT mild or absent.

Reasons for prominent splenomegaly:
1. **Extramedullary hematopoiesis** — the spleen becomes a major site of RBC production
2. **Hemolysis** — splenic sequestration and destruction of abnormal RBCs
3. **Iron overload** — secondary hemochromatosis (though less than major)
4. **Chronic stimulation** — years of compensatory erythropoiesis

Splenomegaly can become massive (20–30 cm) and may cause:
- Splenic infarction
- Hemolytic crises
- Portal hypertension
- Pancytopenia (hypersplenism)

### Comparison: Splenomegaly Across Thalassemia Types

| Type | Splenomegaly Severity | Reason |
|------|----------------------|--------|
| **Thalassemia trait** | Absent or minimal | Mild anemia, minimal hemolysis |
| **Thalassemia intermedia** | **Marked (20–30 cm)** | Significant extramedullary hematopoiesis + hemolysis |
| **Thalassemia major** | Massive (can exceed 30 cm) | Severe extramedullary hematopoiesis + transfusions |

### Why Option 3 Is Incorrect

**Warning:** A common misconception is that splenomegaly is mild in thalassemia intermedia. In reality:
- Splenomegaly is **marked and often massive**
- It is a defining clinical feature of thalassemia intermedia
- Splenic complications (infarction, hypersplenism) are common

### Common Forms of Thalassemia Intermedia

1. **HbE-β-thalassemia** (Southeast Asia) — very common
2. **β-thalassemia with mild mutations** (e.g., β^+^ mutations)
3. **Hemoglobin Lepore** (rare)
4. **α-thalassemia with 3 gene deletions** (HbH disease)

### Clinical Pearl

Thalassemia intermedia patients often present in adolescence or early adulthood with complications of chronic hemolysis (gallstones, leg ulcers, bone disease) and massive splenomegaly — not the transfusion-dependent crisis picture of thalassemia major.

[cite:Robbins 10e Ch 12]

Answer

A. HbE-β-thalassemia is a common form of thalassemia intermedia in Southeast Asia

Answer

C. Patients have moderate anemia (Hb 7–10 g/dL) and do not require regular transfusions

Answer

D. Ineffective erythropoiesis and hemolysis both contribute to the anemia

A 5-year-old girl from Kerala with β-thalassemia intermedia is being evaluated. Which of the following statements about thalassemia intermedia is NOT correct?

Explanation

Thalassemia Intermedia: Clinical and Pathologic Features

Definition and Severity Spectrum

Pathophysiology

Splenomegaly in Thalassemia Intermedia

Comparison: Splenomegaly Across Thalassemia Types

Why Option 3 Is Incorrect

Common Forms of Thalassemia Intermedia

Clinical Pearl

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Mechanism	Contribution to Anemia
Ineffective erythropoiesis	Intramedullary hemolysis of abnormal RBC precursors
Hemolysis	Circulating RBC destruction (shorter RBC lifespan)
Imbalanced globin chains	Excess α chains precipitate, causing oxidative damage

Type	Splenomegaly Severity	Reason
Thalassemia trait	Absent or minimal	Mild anemia, minimal hemolysis
Thalassemia intermedia	Marked (20–30 cm)	Significant extramedullary hematopoiesis + hemolysis
Thalassemia major	Massive (can exceed 30 cm)	Severe extramedullary hematopoiesis + transfusions