Red blood cells (RBCs) are normally round. In ovalocytosis, the cells are oval. Other conditions that produce abnormally shaped RBCs include spherocytosis and eliptocytosis.
Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.