I feared my son had a brain tumour but he’d been poisoned with vitamin D

• Vitamin D toxicity can present with neurological symptoms mimicking serious pathology such as brain tumours, necessitating consideration in differential diagnosis when imaging is inconclusive
• Accidental vitamin D overdosing may occur through prescription errors or miscalculation of paediatric doses, highlighting the importance of careful dosing verification before dispensing
• Hypercalcaemia secondary to vitamin D toxicity requires prompt recognition and management to prevent neurological complications and other systemic effects

Investigations found Roo had been accidentally poisoned with a dose of vitamin D prescribed for growing pains.

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