Clinical Scenario:
A 10-year-old boy with a known history of chronic liver disease is brought to the emergency department after two episodes of hematemesis. His parents report progressive abdominal distension and easy fatigability over the past year. On examination, he is pale, has scleral icterus, spider nevi over the upper chest, a firm enlarged liver, moderate ascites, and massive splenomegaly. Laboratory investigations show: hemoglobin 8.5 g/dL, white blood cell count 2.8 × 10⁹/L, platelet count 58 × 10⁹/L, serum albumin 2.6 g/dL, total bilirubin 4.8 mg/dL, and INR 1.8.
What is the most likely cause of the pancytopenia in this child?
A. Aplastic anemia
B. Bone marrow infiltration
C. Hypersplenism
D. Iron deficiency anemia
E. Vitamin B12 deficiency
Correct answer & Explanation:
Correct Answer: C. Hypersplenism
Explanation
This child has decompensated chronic liver disease with portal hypertension. The presence of massive splenomegaly, ascites, hypoalbuminemia, prolonged INR, and hematemesis from presumed esophageal varices strongly suggests portal hypertension.
The pancytopenia is most likely due to hypersplenism, in which the enlarged spleen sequesters and prematurely destroys blood cells, leading to:
- Anemia
- Leukopenia
- Thrombocytopenia
Hypersplenism is a common hematological complication of portal hypertension in children with chronic liver disease.
Why the other options are incorrect
A. Aplastic anemia
Causes pancytopenia but is associated with bone marrow failure and does not explain the marked splenomegaly or features of portal hypertension.
B. Bone marrow infiltration
Can cause pancytopenia but is usually associated with malignancy and does not account for ascites, variceal bleeding, or portal hypertension.
C. Hypersplenism
Correct. Portal hypertension causes splenic congestion, resulting in sequestration of red blood cells, white blood cells, and platelets.
D. Iron deficiency anemia
May contribute to anemia after chronic gastrointestinal blood loss but does not explain leukopenia and thrombocytopenia.
E. Vitamin B12 deficiency
Can produce pancytopenia but typically presents with macrocytic anemia and neurological manifestations rather than portal hypertension and massive splenomegaly.
Learning Point
In children with chronic liver disease, the combination of:
- Massive splenomegaly
- Pancytopenia
- Portal hypertension
is highly suggestive of hypersplenism. The most common hematological abnormality is thrombocytopenia, followed by leukopenia and anemia.
