An improved fluidizable patient support system including an oval tank, a perforated plate received in the tank atop a plurality of spacers, a diffuser board located atop the perforated plate and sealed around its edge, a mass of granular material received atop the diffuser board, a flexible sheet removably secured around upper edges of the tank by snap fitting elements, a wheeled support pedestal for the tank which has a fluid pressure generator therewithin. Pivotal steps and side rails may be associated with the pedestal and tank respectively. A support frame may also be secured to the tank, extending thereabove to receive treatment apparatus.