Getting image recognition to work to "replace" radiologists is both a game-changer and a HUGE money-saver and thus a GIGANTIC opportunity. Radiology is the most common specialty and one of the highest-paid in just the US -- 40,000+ radiologists earning $350k/year (so maybe $15 bn in salaries). Radiologists and thus some of the smartest & most capable people in the country and they spend the whole day just looking at images...computers should be doing this!! Not only that, computers will soon better...for many skin tumors and others, even the leading human experts differ in their opinion, so humans today out-perform computers but I don't foresee that being the case for long.
A game-changer in cancer treatment would be "early detection". Once it gets to be inexpensive to analyze images, then we can have vastly earlier cancer detection...you could work into a scanning machine in a local pharmacy, get scanned & get the analysis right there...you could go in for monthly scans. Theranos had something of that vision with a drop of blood in pharmacies which could also provide very early detection of cancer...but they didn't execute technically among other issues.