Letter D
DURAL ECTASIA
A softening or “laxity” of the dura that can occur in the brain or spine. It is usually of no consequence but when large enough can cause mass effect or erosions on the bones.
DURAL VENOUS SINUS
Are normal venous channels in the brain that drain the blood. It consists of the major and minor dural veins. The major dural veins are the superior and inferior sagittal sinus, the straight sinus, vein of Galen, and the transverse and sigmoid sinuses.
DURAL VENOUS SINUS THROMBOSIS
An abnormal clotting of the dural sinuses that results in a blockage of blood flow. This can be serious as the brain could bleed or stroke. Most commonly a thrombosis can be caused by abnormal blood clotting, medications such as oral contraceptives, or tumors.
DYSTROPHIC CALCIFICATIONS
These can have many different appearances. These are usually irregularly shaped but have smooth borders (). These are usually considered not cancerous.
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