Abstract
Rickets is typically due to nutritional cause, namely vitamin D and calcium deficiency worldwide. When there is suboptimal response to conventional vitamin D and calcium supplementation, alternative causes have to be sought. We report a rare case of vitamin D-dependent rickets (VDDR) who presented with rachitic features but normal total 25-hydroxyvitamin D 25(OH)D level. Conventional inactive vitamin D supplementation was ineffective and high dose of alfacalcidol was required to maintain normocalcaemia.
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