Secondary Fahr's Disease: A Consequence of Post-Thyroidectomy Hypoparathyroidism.

Abstract

ObjectiveThe objective of this case report is to emphasize the importance of considering uncommon conditions like Fahr’s disease in the differential diagnosis of seizures and cognitive impairment, especially in patients with a history of thyroidectomy.Material and MethodsA 56-year-old woman who had undergone subtotal thyroidectomy 25 years previously presented with movement disorder and cognitive impairment secondary to hypoparathyroidism. A CT scan of the brain showed pathognomonic bilateral calcification in the basal ganglia, thalamus and cerebellar nuclei.ResultThe patient was diagnosed with Fahr’s disease caused by post-thyroidectomy hypoparathyroidism and successfully managed with oral calcium, carbidopa/levodopa and haloperidol.ConclusionWe recommend the routine use of CT scanning in the long-term follow-up of post-thyroidectomy patients.LEARNING POINTSCT scans of the brain should be routinely carried out as part of long-term follow-up after thyroidectomy.Cognitive impairment and/or seizures should also be investigated using brain imaging.Taking a detailed history is a cornerstone of diagnosis in internal medicine.