V Wadhwa, A Patel
chorio athetosis, dementia, dystonia, fahr, parkinsonism, schizophrenia
V Wadhwa, A Patel. Fahr disease. The Internet Journal of Radiology. 2008 Volume 10 Number 1.
A 33yr old male came to our dept with history of dementia, gait disorder & focal seizures. On plain ct brain following findings were seen-bilateral symmetrical basal ganglia , internal capsule, thalami, sub cortical white matter and cerebellar grey matter calcifications – suggestive of fahr disease
Fahr disease/Cerebrovascular ferrocalcinosis/Idiopathic non arteriosclerotic cerebral calcifications /Bilateral strio pallidodentate calcinosis/ Idiopathic basal ganglia calcification
It is a rare degenerative neurological disorder characterized by extensive bilateral basal ganglia calcifications that can lead to progressive dystonia,parkinsonism,and neuropsychiatric manifestations.
Usually asymptomatic in first two decades of life,despite presence of multiple brain calcifications.
Bimodal pattern of clinical onset-
Early adulthood(schizophrenic like psychosis)
Sixth decade(extrapyramidal syndrome, subcortical dementia)
Neurological manifestations vary,but movement disorders are most common.
Parkinsonism most common, usually permanent and progressive.
Childhood transient parkinsonism also reported.
Paroxysmal dystonic chorioathetosis.
Most common sign/symptoms
Cognitive impairment(subcortical dementia)
Extrapyramidal movement disorders.
-an infantile form also described.
Best diagnostic clue-bilateral symmetric basal ganglia ca+2 on CT
Location- -globus pallidum-most commom site of ca+2
Lateral pallidum more affected than medial pallidum.
Additional areas of involvement may include-
Putamen, caudate nuclei, thalami.
Cerebellum(especially dentate nuclei)
Cerebral white matter,internal capsule.
NECT-bilateral, symmetrical calcium in basal ganglia, cerebral white matter, dentate nuclei, cerebellum.
Calcifications seen in-
Dr UMESH.K (prof & hod), Dr VINAY (assoc prof)