In the later days after subarachnoid hemorrhage, the arteries of the brain may become irritated and go into spasm. This spasm or narrowing is know as "vasospasm". Severe spasm can lead to a stroke. Although there is no cure of vasospasm, there are some treatments. Here at Penn State Milton S. Hershey Medical Center, not only are we able to treat vasospasm in the conventional manner with medications and fluids, but we are also able to utilize newer endovascular techniques. Endovascular treatment for vasospasm is only available at specialized centers, and involves the balloon dilatation (stretching) of the narrowed or spasm blood vessel and/or the instillation of vasodilating medications directly into the effected blood vessel.