SAH is blood in subarachnoid space, affecting middle-aged patients under 60. Accounts for 3% of strokes and 5% of stroke deaths. Risk factors include family history, hypertension, and female gender
ICA dissection affects 20-25% of strokes in patients under 45 years. Mean age of occurrence is 45 years with male predilection of ~55%. Winter season shows increased incidence. Risk factors include hypertension, migraine, hyperhomocysteinemia, and connective tissue disorders
Bleeding within skull affects 2.5 per 10,000 people yearly. Can lead to increased intracranial pressure and brain herniation. Most common cause is trauma, affecting 50-60% of cases
IVH occurs when blood enters brain's ventricular system, affecting cerebrospinal fluid production. 30% are primary, caused by trauma or tumors, while 70% are secondary. Occurs in 35% of moderate to severe traumatic brain injuries. Most common in premature infants, especially those with very low birth weight
ICH is sudden bleeding into brain tissues or ventricles. Intraparenchymal hemorrhage occurs within brain parenchyma. Intraventricular hemorrhage affects cerebrospinal fluid production
Cerebellar stroke affects blood vessels in brain's lower-back area. Cerebellum controls balance, voluntary movements, and eye movements. Less than 2% of all strokes are cerebellar strokes