An expansile bone lesion is noted at the right petrous apex measuring 3 x 1.7 x 3.5 cm in AP, SS and CC dimensions with mild heterogeneous texture with intact outline covered with intact thin cortical rim.
It is extending all through the right side of the clivus involving the region of right Dorello canal with a narrow transition zone and sharp lobulated contours. It expresses low signal intensity on T1, high signal intensity on T2 and FLAIR, heterogeneous postcontrast enhancement, no diffusion restriction and no hemorrhagic changes with partial preservation of internal bone septae but rarefaction.
It is encroaching upon the right CPA cistern and right side of prepontine cistern. It exerts narrowing of the right vestibular aqueduct.
Thinning and elongation of right lateral rectus muscle with esotropia of right eye, suggestive of right abducens nerve palsy.