If I understand the question, I would just crop the image and then print that page with expand to fit selected.
Using the Marquee Zoom tool select the region of interest.
Perform File > Print.
In the Print dialog tick Current View.
The selected (via the Marquee Zoom tool) region prints.
Or, after using the Marquee Zoom tool to select the region of interest use your computer's Prnt Scrn.
Open a image program (Windows Paint would do) and paste the image.
If you are working on a Mac, once you have enlarged the area you want, hit command and shift and 4 and you will get a target marker on screen, drag over the area you want and you should hear a camera click when you release. On your desktop should be an image with the title Screen Shot followed by the date and time. This file can be opened directly in Acrobat Pro and resaved/printed.
Hope this helps.