<prompt> Pancytopenia with hypercellular marrow is due all EXCEPT:MyelodysplasiaParoxysmal nocturnal hemoglobinuriaSarcoidosisDyskeratosis congenital  <response>: Dyskeratosis congenital REF: Harrisons Internal Medicine 17th ed Chapter 102, table 102-1 Differential Diagnosis of Pancytopenia Pancytopenia with Hypocellular Bone Marrow Acquired aplastic anemia Constitutional aplastic anemia Fanconis anemia, dyskeratosis congenita Some myelodysplasia Rare aleukemic leukemia AML Some acute lymphoid leukemia Some lymphomas of bone marrow Pancytopenia with Cellular Bone Marrow Primary bone marrow diseases Secondary to systemic diseases Myelodysplasia Systemic lupus erythematosus Paroxysmal nocturnal hemoglobinuria Hypersplenism Myelofibrosis B12, folate deficiency Some aleukemic leukemia Overwhelming infection Myelophthisis Alcohol Bone marrow lymphoma Hairy cell leukemia Brucellosis Sarcoidosis Tuberculosi Leishmaniasis Hypocellular Bone Marrow - Cytopenia Q fever Legionnaires disease Anorexia nervosa, starvation Mycobacteria 