Subependymal grey matter heterotopia, also known as periventricular heterotopia, is the most common form of grey matter heterotopia and is characterised by nodules of grey matter located immediately beneath the ependyma of the lateral ventricles. It can be divided according to morphology into 2 1  : unilateral focal.
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The most popular type of can crusher without any doubt is a vertical or wall mounted can crusher. But there are some occasions that you cannot mount a crusher to a wall and need to install it to a horizontal surface such as table, or you donât want to install the crusher at all and use it as a portable can crusher. For this case you need to purchase one of tools called portable can crushers.