 Also known as nephropathic juvenile cystinosis or adolescent cystinosis, this form of cystinosis is characterized by all of the signs and symptoms of nephropathic cystinosis described above. However, onset of these symptoms does not occur until later perhaps around 8 years of age. Generally, the symptoms are less severe than in the classical infantile nephropathic form and have a slower progression. If untreated, endstage renal failure in intermediate cystinosis usually develops at some point between 15 and 25 years of age. There is a spectrum of disease severity in cystinosis, with overlap of the infantile and intermediate forms. 