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The low-mass dielectron signal from heavy-ion collisions at the CERN--SPSreported by the {\em CERES} collaboration is in excess of estimated hadronicdecays suggestive of possible contribution from two-pion annihilation or otherhadronic reactions. In the absence of dramatic medium modifications,annihilation alone is unable to account for the data. We explore the role ofpion plus resonance scattering [$\pi\rho\to a_{1}(1260) \to \pi e^+e^-$] whichhas favorable kinematics to populate masses between $2m_{\pi}$ and $m_{\rho}$.While it seems to account for some of the remaining excess beyond annihilation,it fails to allow quantitative interpretation of data.Comment: 11 pages LaTeX, 3 PostScript figure

Excess electron pairs from heavy-ion collisions at CERN and a more complete picture of thermal production