Cystinotic rickets treated with vitamin D metabolites

A 22-month-old girl with cystinotic rickets was given 1 microgram 1,25-dihydroxycholecalciferol (1,25-DHCC) daily in addition to standard treatment. Her rickets healed and linear growth rate appeared to increase. It is suggested that the effect of 1,25-DHCC and its metabolically active analogues on cystinotic rickets should be further studied.