Hi everyone: Suppose $A\subset \mathbb{R}^{m}$ ($m>1$) is a closed set with empty interior. We know that $A$ has not necessarily a neighborhood $V$ such that every bounded component of $ \mathbb{R}^{m}\setminus A$ has a point of $\mathbb{R}^{m}\setminus V$. Which are the necessary and sufficient conditions that such a $V$ should exist?