The present invention provides an implant for positioning within a particularly dimensioned body cavity. The implant is reversibly deformable between an expanded state and a compressed state. The implant is constructed and arranged for insertion within the body cavity when in its compressed state, and pressurelessly conforms to the cavity dimensions in its expanded state. Particularly, the implant is characterized by spontaneous deformation to the expanded state in situ within the body cavity while retaining and/or absorbing at least one flowable constituent as a function of its degree of deformation.