Worth1000 hosts daily photoshoping contests, and the regular Medical Anomalies category is a very popular one. On the right you see a Sore Knee. Apparently folks are dissatisfied with the selection of diseases and medical dysfunctions that humans are already subject to.
Contest rules:
Medical anomalies are both disturbing and highly fascinating to see. In this contest you are going to show proof via X-rays, cat scans [sic], sonagrams [sic] and whatever other medical diagnostic tools you can think of to show medical anomalies.
The rules of this game are thus: You will take any x-ray, sonagram [sic], model, skeleton or other medical diagnostic tool and use it to create a medical hoax.
Medical Anomalies Contest page …
(hat tip: Street Anatomy)