Fibrous dysplasia. [Head and Neck] [CT] [MR]

Female in her 20s with (all right-sided) proptosis, intermittent vision loss, facial pain, and mid to lower face numbness.

Coronal and axial CT images show a homogenous bony expansile process that results in narrowing of the soft tissue compartments of the face. As a result, the right eye is pushed forward (proptosis; as seen on the MR image), and many of the right-sided (as well as some left-sided) skull base foramina that carry nerve bundles and blood vessels are severely narrowed.