There are plenty of videos on all kinds of cancer procedures; some are very graphic. It may be easiest to search for them by conducting a search in Google on "videos of breast cancer" or "videos of gastric cancer", etc.
HONmedia is an unique repository of over 6'800 medical images and videos, pertaining to 1,700 topics and themes. This peerless database has been created manually by HON and new image links are constantly being added from the world-wide Web. HON encourages
Consists of over 48,000 high-quality images spanning all of internal medicine, all derived from Current Medicine's series of illustrated atlases. Each image is accompanied by detailed explanatory text and citation of the source