Pancytopenia. Light micrograph (LM) of a section through bone marrow from a patient with pancytopaenia, a reduction in the number of red and white blood cells, and platelets. There can be a number of causes, including bone marrow failure, autoimmune disease and chemotherapy. Symptoms include fatigue, bruising and unexplained bleeding. Treatment depends on the cause. Magnification: x350 when printed at 10 centimetres