  In these proceedings contribution we review our recent results of medium
modifications to the coherence pattern between the initial and final state
radiation. We study single gluon production off a highly energetic parton that
undergoes a hard scattering and subsequently crosses a dense QCD medium of
finite size. Multiple scatterings lead to a partial suppression of the
interferences between different emitters that opens the phase space for large
angle emissions. We briefly discuss the generalization of this setup to
describe gluon production in the case of pA collisions by including finite
length and energy corrections. The configuration studied here may have
phenomenological consequences in high-energy nuclear collisions.
