Reversal of isolated hypogonadotropic hypogonadism: long‐term integrity of hypothalamo–pituitary–testicular axis in two men is dependent on intermittent androgen exposure

Fawzi Bakiri*, Javier Herrera†, Maria Riestra‡, Olivier Perrichot*, Joaquin Pertierra§, Oscar Domingo Bruno†, Thierry Brue¶** and Frederic Castinetti¶** *Department of Endocrinology, Centre Hospitalier Departemental Felix Guyon, St Denis, France, †Division of Endocrinology, Hospital de Cl ınicas, University of Buenos Aires, Buenos Aires, Argentina, ‡Endocrinology Unit, Hospital de Cabue~ nes, Gij on, §Hospital Universitario Central de Asturias, Oviedo, Spain, ¶Department of Endocrinology, Aix-Marseille University, Reference Center for Rare Pituitary Diseases, La Timone Hospital, Assistance Publique Hôpitaux de Marseille, **Centre de Recherches en Neurobiologie et Neurophysiologie de Marseille (CRN2M), CNRS UMR7286, Marseille, France E-mail: frederic.castinetti@ap-hm.fr