BANGKOK, Sha'ban 13, 1437, May 20, 2016, SPA -- Thailand's 88-year-old King Bhumibol Adulyadej has received treatment for 'water on the brain', the Royal Household Bureau said in a statement on Friday, according to Reuters. The world's longest-reigning monarch has been treated for various ailments during a year-long hospitalisation in the Thai capital. He was last seen in public on Jan. 11, when he spent a few hours visiting his Bangkok palace. The palace said examination of the king showed he had 'water on the brain', or hydrocephalus, a build-up of the cerebrospinal fluid that surrounds the brain. He was treated for the same thing last August. Fluid was drained and the king was being monitored, the statement said. --SPA 22:41 LOCAL TIME 19:41 GMT www.spa.gov.sa/w