  Let $\mathcal F$ be a holomorphic foliation on a compact K\'ahler surface
with hyperbolic singularities and no foliation cycle. We prove that if the
limit set of $\mathcal F$ has zero Lebesgue measure, then its complement is a
modification of a Stein domain. The proof consists in building, in several
steps, a metric of positive curvature for the normal bundle of $\mathcal F$
near the limit set. Then we construct a proper strictly plurisubharmonic
exhaustion function for the complement of the limit set, by adapting Brunella's
ideas to our singular context. The arguments hold more generally when the limit
set is thin, a property relying on Brownian motion.
