venerdì 28 settembre 2007

CNS effect of hepatic cirrhosis

Additional clinical information: Patient has hepatic cirrhosis.


There is T1 shortening of the basal ganglia, internal capsules and corticospinal tracts bilaterally. No area of abnormal contrast enhancement. There is mild cerebellar atrophy. The ventricles are normal in size and configuration. There are normal vascular flow-voids. There is no mass or abnormal fluid collection.

Differential diagnosis of T1 hyperintensity of basal ganglia:
- Cirrhosis
- TPN (manganese deposition)
- Calcification
- Products of hemoglobin breakdown (methemogbobin)
- Melanoma
- Lipid materials

Differential diagnosis (in general, abnormal intensity of basal ganglia):
- Metabolic etiologies
- Mitochondrial disorders (Leigh Syndrome)
- Methylmalonic acidemia
- Wilson's disease
- Hallervorden-Spatz
- Toxins (CO, methanol, cyanide)
- Hypoxia

Diagnosis: CNS effect of hepatic cirrhosis (Toxic-metabolic effect on basal ganglia and white matter, thought to be secondary to metal deposition)

Key points

T1 hyperintensity on MRI indicates increased fat or metallic deposition. Normally, the liver removes excess metals for storage or excretion; failure leads to hemochromatosis or Wilson's disease, in 2 examples. Another example is portosystemic shunting, as a result of liver disease (or in the case of a TIPS shunt to relieve portal hypertension). In these cases, the basal ganglia undergo metallic deposition. In the case of cirrhosis, deposition of manganese and copper lead to the bright T1 signal in the basal ganglia. In fact, degree of signal intensity quantitatively relates to the tissue concentration of manganese in the basal ganglia.

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