FIG 1. 27-year-old woman with progressive onset of occipital and temporal headache.

A, Contrast-enhanced CT scan shows a well-delineated spontaneously hyperdense lesion with minimal enhancement located above the right cerebellopontine angle.

B, Left vertebral selective angiogram (anteroposterior view) shows slow opacification of the right SCA (arrow).

C, Right SCA supraselective injection shows the fusiform aneurysm of a distal hemispheric branch (arrow).

D, Same injection as in C after embolization shows obliteration of the aneurysm along with its parent artery (arrow points to the coil inside the aneurysm).

E, T2-weighted MR image 2 years after treatment shows the low signal intensity of the coil and almost complete disappearance of the mass.