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The detection of a "Cold Spot" in the CMB sky could be explained by thepresence of an anomalously large spherical underdense region (with radius of afew hundreds Mpc/h) located between us and the Last Scattering Surface.Modeling such an underdensity with an LTB metric, we investigate whether itcould produce significant signals on the CMB power spectrum and bispectrum, viathe Rees-Sciama effect. We find that this leads to a bump on the powerspectrum, that corresponds to an O(5%-25%) correction at multipoles 5 < l < 50;in the cosmological fits, this would modify the \chi^2 by an amount of orderunity. We also find that the signal should be visible in the bispectrumcoefficients with a signal-to-noise S/N ~ O (1-10), localized at 10 < l < 40.Such a signal would lead to an overestimation of the primordial f_{NL} by anamount \Delta f_{NL} ~ 1 for WMAP and by \Delta f_{NL} ~ 0.1 for Planck.

The Cold Spot as a Large Void: Rees-Sciama effect on CMB Power Spectrum and Bispectrum