  We investigate the scattering response of parity-time (PT) symmetric
structures. We show that, due to the local flow of energy between gain and loss
regions, such systems can deflect light in unusual ways, as a function of the
gain/loss contrast. Such structures are highly anisotropic and their scattering
patterns can drastically change as a function of the angle of incidence. In
addition, we derive a modified optical theorem for PT-symmetric scattering
systems, and discuss its ramifications.
