BMJ Case Reports 2012; doi:10.1136/bcr.12.2011.5359
  • Reminder of important clinical lesson

Anticonvulsant-induced rickets and nephrocalcinosis

  1. Koyelle Papneja2
  1. 1Pediatrics Department, McMaster University, Hamilton, Canada
  2. 2Health Sciences Department, McMaster University, Hamilton, Canada
  1. Correspondence to Dr Keith K Lau, kelau{at}


Reported here is the case of a severely disabled young girl who developed Fanconi syndrome secondary to long-term valproic acid administration, ultimately leading to hypophosphatemic rickets. Although nephrocalcinosis is not a common feature in patients with proximal tubulopathy, the patient presented also with this condition, and the concomitant use of another anticonvulsant might have potentiated this condition. The purpose of this report is to increase awareness among healthcare providers of such rare but significant complications associated with anticonvulsants.


  • Competing interests None.

  • Patient consent Obtained.

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