Rieder cells
Pronunciation: rē′dĕr
Definition: abnormal myeloblasts (12–20 mcm in diameter) in which the nucleus may be widely and deeply indented (suggestive of lobulation), or may actually be a bilobate or multilobate structure; such cells are frequently observed in acute leukemia, and probably represent a more rapid maturation of the nucleus than that of the cytoplasm.
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Examples: glitazone, GI cocktail, etc.

