We report the case of a 33 year-old woman at the second quarter of pregnancy, with known brain aneurysm admitted in intensive care unit for sudden coma. The coma was not related to a rupture of the brain aneurysm but to a serious haemorrhagic shock caused by a spontaneous splenic rupture. This case report illustrates the difficulty of this unrecognized diagnosis and reminds us to suspect a spontaneous splenic rupture in front of any pregnant woman with atypic abdominal pain and haemorrhagic shock.