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 :
The cost of crown molding depends largely on the material, finish, and detail of the design you choose. Basic styles may cost as little as $2-$3 per linear foot, while custom designed and cut moldings prepared by a finish carpenter cost $8-$10 or more per linear foot.
Polyurethane is a versatile material that can be worked into almost any design. However, like MDF molding, it is prone to denting and may not hold paint or stain for proper finishing. The cost of polyurethane crown molding runs from $2 to $6 per linear foot, not including installation.