Medicine General d8e2c7ab All of the following are causes of pancytopenia with cellular bone marrow except: A Paroxysomal noctural hemoglobinuria B Dyskeratosis congenita C Megaloblastic anemia D Hairy cell leukemia High-Yield Explanation Answer is B (Dyskeratosis congenita) Dyskeratosis congenita is associated with Pancytopenia and a hypocellular marrow.