  We show how to evaluate tensor one-loop integrals in momentum space avoiding
the usual plague of Gram determinants. We do this by constructing combinations
of $n$- and $(n-1)$-point scalar integrals that are finite in the limit of
vanishing Gram determinant. These non-trivial combinations of dilogarithms,
logarithms and constants are systematically obtained by either differentiating
with respect to the external parameters - essentially yielding scalar integrals
with Feynman parameters in the numerator - or by developing the scalar integral
in $D=6-2\e$ or higher dimensions. As an explicit example, we develop the
tensor integrals and associated scalar integral combinations for processes
where the internal particles are massless and where up to five (four massless
and one massive) external particles are involved. For more general processes,
we present the equations needed for deriving the relevant combinations of
scalar integrals.
