Magnetic resonance imaging findings in bilateral basal ganglia lesions.
BACKGROUND
Radiologists may encounter bilaterally symmetrical abnormalities of the basal ganglia on magnetic resonance imaging (MRI), typically in the context of diffuse systemic, toxic or metabolic diseases. A systematic approach and broad knowledge of pathology causing this uncommon group of conditions would be useful.


METHODS
This review uses illustrative images to highlight metabolic conditions, such as Leigh's syndrome, citrullinaemia, hypoglycaemia or carbon monoxide poisoning, as well as other causes of bilateral basal ganglia lesions such as osmotic myelinolysis, deep cerebral venous thrombosis and Creutzfeldt-Jakob disease.


RESULTS
Careful assessment of radiological findings outside the basal ganglia, such as involvement of the cortex, white matter, thalamus and pons, together with clinical correlation, may be helpful in narrowing the differential diagnosis, and directing further radiological, biochemical or genetic investigations. Recent advances in MR technology have resulted in newer techniques including diffusion-weighted (DW) MR imaging and MR spectroscopy (MRS); these may be helpful if appropriately used.


CONCLUSIONS
Abnormal MRI findings in the basal ganglia should not be interpreted in isolation. A systematic approach including DW MR imaging, MRS, and a broad knowledge of diffuse systemic, toxic or metabolic diseases is helpful.
Lim
C C Tchoyoson
CC
Department of Neuroradiology, National Neuroscience Institute, Singapore. tchoyoson_lim@nni.com.sg
D001480:Basal Ganglia Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000503:physiopathology; D001928:Brain Diseases, Metabolic / Q000175:diagnosis / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D006801:Humans; D008279:Magnetic Resonance Imaging; D011859:Radiography