They are generally considered to be not only incurable but also untreatable. The Egyptian physicians recognized three categories of injuries; treatable, contestable, and untreatable ailments. All known prion diseases are untreatable and fatal. Synge developed Hodgkin's disease, a metastatic cancer that was then untreatable. McNerney was diagnosed with untreatable lung cancer in the spring of 2010. Tests on experimental drugs are sometimes conducted on sufferers of an untreatable condition. Psoriasis in those with HIV/AIDS is often severe and may be untreatable with conventional therapy. Sometimes, psychiatric patients that have proven to be untreatable, can get euthanasia. This opens up for development of treatment for this currently untreatable disease. However, she developed a rare form of cancer that is untreatable. The first formal acknowledgment of advanced melanoma as untreatable came from Samuel Cooper in 1840. Previously considered untreatable, in recent years several drugs have been identified for treatment of nystagmus. This expansive definition of "survivor" includes people who are dying from untreatable cancer. Before the advent of modern medicine, many physiological conditions were untreatable. However, the idea that SCI was untreatable remained predominant until the early 20th century.