  We discuss medium modification of the rho meson originating from its coupling
to in medium quasi-pions and delta-hole states. This medium effect leads to a
marked structure of the rho meson strength function in the $500 MeV$ invariant
mass region. We suggest that this effect may provide an explanation of the
structure observed by the DLS collaboration in the $Ca+Ca/C+C$ ratio at $1
GeV/u$.

Nuclear Theory