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We investigate the nonlinear dynamics of multi-dimensional optical pulses propagating in an isotropic selfdefocusing medium. Using a method of multiple-scales we show that the nonlinear evolution of the pulses is goveed by Davey-Stewartson equations. Dromion-like nonlinear localized structures (high-dimensional optical solitons) excited from a continuous wave background and decaying in all spatial directions are predicted through the interaction between a wavepacket superposed by short-wavelength components and a long-wavelength mean field generated by an optical rectification.