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?
Answer:
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