A complex abnormality of the right PICA is shown - shortly after its origin there is an eccentric high-grade stenosis with small false aneurysm, and some 10 mm beyond this is a smaller 3 mm mixed fusiform and saccular aneurysm, just beyond this a larger 4.5 millimetre aneurysm at the bifurcation of PICA, incorporating both branches in its base. The left vertebral is patent and fills the basilar but is of smaller calibre. No other intracranial aneurysm, and no arteriovenous or dural arteriovenous fistula or malformation is shown.