An extension of dura between the right and left hemispheres of the brain.

A benign tumor of the hearing nerve (eighth cranial nerve), also called vestibular schwannomas. More about acoustic neuromas.

A benign growth formed of glandular tissue.

A graft of bone or tissue between individuals of the same species. Allografts are usually obtained from cadavers.

An abnormal bulging or stretching of a weakened wall of a blood vessel.  More about aneurysms.

Imaging of blood vessels using injected contrast material (dye) to better visualize the vessels. The word is derived from angio (blood vessels) and gram (record or picture). 

The reconstitution or recanalization of a blood vessel. Angioplasty may involve balloon dilation, the mechanical stripping of intima (innermost layer of an artery), forceful injection of a thrombolyti [..]

The tough outer ring of a spinal disk.

A medication that prevents coagulation of the blood.

Difficulty with language, or the loss of use of language, in reading, writing, or speaking. This failure to understand the written, printed, or spoken word is not related to intelligence, but to speci [..]