Show a partial without the layout.jade file

I'm using layout.jade as a template for all the partials. layout.jade includes a header, footer, sidebar etc, and the partials is what is shown in the body.

Now I've implemented a lightbox with iframe, to show one of the partials in. The problem is that I don't want the header, footer etc to be shown inside the lightbox, just the partial jade file.

Is there a way to exclude layout.jade in this case?

Thanks in advance!