Fahrs syndrome is a rare anatomoclinical entity whose main etiology is primary or postoperative hypoparathyroidism. It is characterized by bilateral and symmetrical intracerebral calcifications, localized in the basal ganglia. Hypoparathyroidism, primary or postoperative, is the most classic anomaly. Hyperparathyroidism is exceptionally reported as a cause of Fahr syndrome. We report the case of a 30-year-old woman who presented with an inaugural convulsive seizure revealing Fahrs syndrome secondary to iatrogenic hyperparathyroidism.