What is the difference between central pontine myelinolysis and extrapontine myelinolysis?

What is the difference between central pontine myelinolysis and extrapontine myelinolysis?

Myelinolysis doesn’t always occur in the pons (the middle part of your brainstem). Extrapontine myelinolysis (EPM) is when myelinolysis occurs outside the pons in other parts of your brain. EPM rarely occurs without CPM. About 1 in 4 people with CPM also have EPM.