The authors report on a rare aneurysm of the posterior inferior cerebellar artery (PICA) at the site of insertion of the choroidal branches in a 30-year-old man. It was manifested by relapsing isolated intraventricular haemorrhage. After the second attack the originally small aneurysm increased in size and formed a pseudoaneurysm which was obliterated by spirals in two stages. During the second session the supplying artery closely to the aneurysm was also obliterated. The authors made an anatomical and clinical analysis of distal aneurysms of the PICA and discuss contemporary therapeutic possibilities of these aneurysms.

        Key words: aneurysm of the posterior inferior cerebellar artery (PICA), pseudoaneurysm, intraventri- cular haemorrhage, endovascular therapy