From a TCIA user:
I am having difficulty opening the images in the nlst-path folder that are in format *.SVS do you know of any program in windows or linux that opens these images?
1) My understanding is that Aperio Imagescope software is free and can view the .SVS files. http://www.leicabiosystems.com/digital-pathology/digital-pathology-management/imagescope/
2) https://wiki.cancerimagingarchive.net/display/NLST/NLST+Pathology suggests you can use caMicroscope to view the slides in a linked-way to the DICOM; Here is a page that might help you get going with that: https://wiki.nci.nih.gov/display/CTIIP/Digital+Pathology+and+Integrative+Query+System+Documentation