Which condition is characterized by pancytopenia with hypocellular bone marrow?

• A. Aplastic anemia
• B. Leukemia
• C. Hemophilia
• D. Iron deficiency anemia

Answer: (A)

Pancytopenia with hypocellular bone marrow points to bone marrow failure. In aplastic anemia, the hematopoietic stem cells are depleted or suppressed, so the marrow becomes hypocellular and is often largely replaced by fat. That loss of marrow cellularity means the production of red cells, white cells, and platelets drops across the board, leading to fatigue, infections, and bleeding tendencies. A bone marrow biopsy shows very low cellularity with scant hematopoietic elements. Other conditions can cause cytopenias, but they don’t fit this marrow picture: leukemia usually shows a hypercellular marrow with blasts; iron deficiency anemia presents as microcytic anemia with low iron and does not feature hypocellularity; hemophilia is a coagulation disorder with normal marrow function. So the described pattern is most consistent with aplastic anemia.