Off the coast of British Columbia

Thetis Island is an island and unincorporated community off the coast of British Columbia, Canada, lying between Vancouver Island, which is to the west across Stuart Channel, and the west from the north tip of Galiano Island, from which it is separated by Trincomali Channel. With its immediate southern neighbour Penelakut Island, it is one of the Gulf Islands. Thetis island is 2,560 acres (10.36 km²) in size. It is approximately two miles wide and three miles long north to south. Two north to south land ridges define the east and west sides of the island. Burchell Hill is 503 feet above sea level, and forms the high point on the west side of Thetis island, and Moore Hill is 511 feet above sea level, and forms the high point ridge on the east side of the island.

Posterior reversible encephalopathy syndrome (PRES), also known as reversible posterior leukoencephalopathy syndrome (RPLS), is a rare condition in which parts of the brain are affected by swelling, usually as a result of an underlying cause. Someone with PRES may experience headaches, changes in vision, and seizures, with some developing other neurological symptoms such as confusion or weakness of one or more limbs. The name of the condition includes the word \"posterior\" because it predominantly, though not exclusively, affects the back of the brain. Common underlying causes are severely elevated blood pressure, kidney failure, severe infections, certain medications, some autoimmune diseases, and pre-eclampsia. The diagnosis is usually made by a brain scan (MRI), in which areas of swelling can be identified.