A 30-year-old man presented to the emergency department after a generalized tonic-clonic seizure. He had suffered a similar seizure 1 year prior, for which no investigations were done. The past history and family history were otherwise unremarkable with no risk factors for epilepsy. The physical examination was normal. Serum biochemistry showed a corrected calcium concentration of 1.19mmol/L (normal range 2.2-2.6 mmol/L), phosphate concentration of 1.98 mmol/L (normal range 0.8-1.5 mmol/L) and normal renal function. His electrocardiogram (Fig. 1) and non-contrast cerebral CT scans (Fig. 2) are shown.
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