  Explicit chiral symmetry breaking is a natural feature of many QCD inspired
models with multi-quark interactions. To carry out the 1/N expansion of these
theories, one integrates over the quark fields. In the process of calculating
the one-loop fermion determinant which is not chiral invariant due to quark
masses, special care must be taken in order not to alter the original symmetry
breaking pattern of the Lagrangian. We show how to do this consistently.
