Werndale Hospital provides specialized Hemispherectomy with a focus on controlling severe drug-resistant seizures and improving neurological function in appropriately selected patients. Established in 1991, the accredited hospital is located in Carmarthen, United Kingdom and operates 19 beds with advanced neurosurgical and epilepsy-care facilities.

Hemispherectomy is a specialized epilepsy surgery in which most or all of one cerebral hemisphere is disconnected from the functioning brain. It may be considered for patients with severe, drug-resistant epilepsy arising predominantly from one side of the brain, particularly when seizures significantly affect daily life. The procedure aims to prevent abnormal electrical activity from spreading to the healthy hemisphere. Depending on the underlying condition, different techniques may be used, including functional hemispherectomy or hemispherotomy.