The authors report 2 infants with unawares conciousness alteration. Magnetic resonace imaging and magnetic resonance angiography demonstrated intracranial saccular aneurysm localised in anterior communicating artery sinistra in one infant and on anterior communicating artery dextra in the second case. This localisation is unusual in infants. In both cases the diagnosis was verified by conventional cathete angiography (CCA).

        Key words: intracranial aneurysm, atypical localisation, infants, magnetic resonance imaging, magnetic resonance angiography, conventional catheter angiography