NCL is short for "Neuronal Ceroid Lipofuscinosis", a very rare metabolic disease which affects in general children between one and eight years.
Depending on the type of NCL the disease starts with a weak eyesight or epilepsy and impairments in the motor function. The disease can go along with blindness, dementia, hallucinations and a complete loss of cognitive and motor functions. At this point of time there are only experimental treatments available , therefore this disease leads to death.
The most common forms of NCL can be detected through a blood testing, in which a certain enzyme gets tested. Is this test positive for NCL, a genetic testing follows to be certain.