50-year-old male. 7-day history of gastroenteritis. He was severely dehydrated and confused.
Plasma sodium = 120mmol/L. Hypertonic saline was given to correct it; 24 hours later, he developed flaccid weakness in all four limbs, and difficulty in swallowing.
Below is a T2-weighted axial image of the brain (Fig. 6.8).
■ What is the abnormality?
■ What conditions are associated with this diagnosis?
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