<unk>  syndrome is debilitating both physically and mentally. In 2004, Peter Spencer stated: "It is, by all reports, a progressive disorder and a fatal disorder, perhaps with a duration of about three years or more." While a few children are said to have recovered from it, many have died from the illness. Seizures can also cause children to collapse, potentially causing injury or death.
Nodding disease
Panner disease
Camisa disease
Caroli disease
Haff disease
Hartnup disease
Kyrle disease
Tornwaldt's disease