  Specific results of the computer simulation of dilepton production from
expanding pion gas created in Pb+Pb 160 GeV/n collisions are presented.
Azimuthal asymmetry of dilepton pairs in non-central collisions and interesting
shape of the rapidity distribution of dilepton pairs are predicted. These
results are understood on theoretical level as a consequence of momentum and
space asymmetries in the initial state of pion gas without any assumption of
thermalization. Implication on the production of dileptons in pre-hadronic
phase of HIC is drawn.
