Necrosis of a pre-existing silent pituitary adenoma was the first diagnosis hypothesis in our case. Bromocriptine as well as pregnancy are indeed two classical predisposing factors associated with apoplexy or intratumoral haemorrhage of a macro adenoma [ 8, 11, 12]. In our case though, MRI at day 7 clearly excluded an intrasellar haemorrhage. It showed an hyposignal T1 and isosignal T2, instead of the spontaneous bright signal expected on both T1 and T2 in the sub acute phase of an haemorrhage, in relation with the extra cellular methemoglobin present at that time