 The establishment of NNI in 1999 resulted in the transfers of the Department of Neurology and Neurosurgery from Tan Tock Seng Hospital (TTSH) to form the foundations of clinical service.A new department of Neuroradiology was also initiated to provide the specialised diagnostic imaging and interventional services for neurological diseases.Today, NNI has a campus co-located with SGH in Outram, but — unlike other SingHealth specialty centres — also has a campus located with Tan Tock Seng Hospital in Novena, Singapore, and provides specialty services to most other hospitals in Singapore as well.