I came across a paper that reads
It is noteworthy that for a sample without lateral light propagation in the material, i.e. [reduced scattering] $\mu_s' = \infty$ and [absorption] $\mu_a=0$, ...
If there is no lateral light propagation from a collimated beam irradiating the surface of a turbid media, then this will mean that there is no scattering. Therefore, is the statement incorrect or what is the author indicating?