The patient is prospectively included. The referring hematologist will inform the patient about participation in the cohort, give him the information note and obtain his non-objection agreement to the use of his data for research purposes.~The data will be collected from the medical file of each patient as part of his usual annual follow-up.
Hereditary stomatocytosis is a heterogeneous group of rare constitutional diseases of dominant transmission in the vast majority of cases. The data concerning their clinical and biological presentation, and their evolution are few, and come from about thirty clinical cases. The constitution of an exhaustive French cohort of hereditary stomatocytosis will improve the establishment of the diagnosis and the management of patients