Pancytopenia with hypercellular marrow could be due to all, EXCEPT:
Dyskeratosis congenita is associated with pancytopenia and hypocellular bone marrow. Pancytopenia with hypercellular marrow is seen in: Myelodysplasia Myelofibrosis Hairy cell leukemia Tuberculosis Sarcoidosis Brucellosis PNH Hypocellular Bone marrow +/- Cytopenia: Q fever Legionnaires disease Anorexia nervosa, starvation Mycobacterium
Myelodysplasia
Paroxysmal nocturnal hemoglobinuria
Sarcoidosis
Dyskeratosis congenita