1. Hereditary elliptocytosis  (Trust Mark: Doctor-Reviewed)
Hereditary elliptocytosis is a disorder passed down through families in which the red blood cells are oval-shaped. See also: Hereditary spherocytosis • Reviewer: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and James R. Mason, MD, Oncologist, Director, Blood and Marrow Transplantation Program and Stem Cell Processing Lab, Scripps Clinic, Torrey Pines, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

2. Hereditary ovalocytosis  (Trust Mark: Doctor-Reviewed)
Hereditary ovalocytosis is rare condition passed down through families (inherited) in which blood cells are slightly oval-shaped instead of round. It is a form of hereditary elliptocytosis.• Reviewer: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and James R. Mason, MD, Oncologist, Director, Blood and Marrow Transplantation Program and Stem Cell Processing Lab, Scripps Clinic, Torrey Pines, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.