the presence of unusually thin or flattened red blood cells that when stained show a dark center and a peripheral ring of hemoglobin, separated by a pale unstained ring containing less hemoglobin, resulting in a bull's-eye appearance and resembling a 3D sombrero when viewed under EM; seen in certain anemias, thalassemias, hemoglobinopathies, obstructive jaundice, and the post-splenectomy state
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