Final answer:
A hemorrhagic stroke is bleeding into the brain parenchyma, often leading to a poor prognosis, and is diagnosed with a CT scan. It occurs due to blood vessel damage within the brain and can result in significant pressure and damage to the brain tissue.
Step-by-step explanation:
A hemorrhagic stroke is the medical term for bleeding into the brain parenchyma, which refers to the functional tissue in the brain where the processing of information occurs. This type of stroke is diagnosed with a CT scan, which can reveal an intraparenchymal hemorrhage within the brain, such as seen in the parietal lobe. The prognosis for this condition is often poor due to the damage caused by the accumulation of blood, the subsequent increase in intracranial pressure, and the potential disruption of cerebral blood flow leading to further brain tissue damage. Damage to blood vessels within the cranial vault can lead to a hemorrhagic stroke, with physical pressure from the accumulating blood contributing to a loss of function and potentially causing edema in adjacent tissues. In scenarios such as a blow to the lateral side of the head, which can fracture the pterion, an underlying artery may be damaged leading to the formation of a hematoma. This accumulation of blood can be deadly if not addressed urgently, as the increased pressure on the brain can rapidly lead to severe health consequences or death.