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Seizure is a common neurological problem in the emergency department. First-time seizure needs careful evaluation to exclude the underlying structural brain lesions. Neuroimaging studies, including magnetic resonance imaging and computed tomography scan, are strongly recommended for all adult patients with first-time seizures. We report the case of a 35-year-old woman who was brought to the emergency department because of the first-time loss of consciousness episode. She developed bilateral jerky movements in both her upper and lower limbs. It was associated with frothy secretions from the mouth and cyanosis. The episode lasted for two minutes and terminated spontaneously. The patient was tired after gaining consciousness. The past medical history of the patient was remarkable for anxiety, depression, and polycystic ovarian syndrome. She has undergone multiple cognitive behavioral therapy sessions, but she did not take any psychiatric medications. Neurological examination did not reveal any focal neurological deficit. The patient underwent a computed tomography scan to exclude any space-occupying lesion. The unenhanced scan demonstrated bilateral symmetrical calcification of the basal ganglia. No calcification was noted in the cerebellum or the cerebral cortex. Otherwise, no intracranial pathology was seen. Such findings conferred the diagnosis of Fahr disease. The patient was discharged on carbamazepine to prevent further seizure episodes. After six months of follow-up, the patient did not experience further convulsion episodes. Fahr disease is a rare disorder with a wide spectrum of manifestations. Despite its rarity, physicians should keep this condition as a possible differential diagnosis when they encounter an adult patient with a first-time seizure, particularly in a patient with a history of neuropsychiatric disorders.