Final answer:
The middle cerebral artery, a branch of the internal carotid artery, is associated with a lens-shaped bleed often due to an epidural hematoma.
Step-by-step explanation:
The artery associated with a lens-shaped bleed is typically the middle cerebral artery, which is a branch of the internal carotid artery. This artery supplies blood to the temporal and parietal lobes of the cerebrum, which are the most common sites of cerebrovascular accidents (CVAs), also known as strokes. A lens-shaped bleed is often because of an epidural hematoma, occurring between the skull and the dura mater, the outermost of the three layers of the meninges surrounding the brain. The middle cerebral artery, being closely related to these areas, is commonly associated with this type of bleed.