PDF bleed dissapers opening in Photoshop

Hi

First time I've come across this one...

A client has sent his artwork through for print as a PDF file. When I open it in Acrobat reader the bleed and crop marks are all there. However when opened in Photoshop CS where I need to set it on a template for print (3 up) it opens without the bleed and crops, just exactly the 'trimmed' size.

Any ideas why and how to resolve this?

I do have Adobe suite Illustrator etc on another machine if that's needed for the solution.

Thanks

Dave