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Let $G$ be a connected semisimple real algebraic group. Assume that $G(\bbR)$ has no compact factors and let $\Gamma$ be a torsion-free uniform latticesubgroup of $G(\bb R)$. Then $\Gamma$ contains a malnormal abelian subgroup$A$. This implies that the $\tto$ factor $\vn(\Gamma)$ contains a masa $\fk A$with Puk\'anszky invariant $\{\infty\}$.

Malnormal subgroups of lattices and the Pukanszky invariant in group factors