the patient can be afebrile The treatment of brain abscess is the same as that of any other abscess: incision and drainage This procedure is diagnostic as well Needle aspiration combined with the administration of broad-spectrum antibiotics will clear approximately 80% to 85% of abscesses The remainder will require craniotomy for complete cure If infection extends to the craniotomy flap; then reoperation, bone flap removal, and drainage of the abscess should be carried out for definitive therapy Subdural Empyema Subdural empyema is rare after craniotomy but may follow burr hole drainage of a chronic subdural hematoma This entity is also marked by neurologic deterioration, with the development of focal signs of hemiparesis, seizures, or both These neurologic findings are related to mass effect from edema that unlike subdural hematomas, is out of proportion to the volume of fluid in the subdural space It can also be further complicated by venous thrombosis and infarction Diagnosis by CT scan may be difficult, and a high index of suspicion is required However, a parafalcine subdural collection, which can be seen on CT scan, is pathognomonic for subdural abscess Treatment with drainage and broadspectrum antibiotics is the gold standard Drainage may be accomplished by reoperation or burr holes, and many surgeons recommend placing subdural catheters for irrigation of this space with antibiotic solutions such as concentrated bacitracin Infarctions Arterial Infarcts Arterial infarct is a rare complication after craniotomy but may occur if there has been substantial intraoperative manipulation of cerebral vessels Clinically, the patient will usually exhibit focal neurologic deficits If a large area or bilateral areas of the brain are involved, the patient may experience a global decrease in level of consciousness and more extensive neurologic deficits Cerebellar infarction, specifically, incurs a higher risk of obstructive hydrocephalus due to occlusion of the fourth ventricle Symptoms and signs related to cerebellar dysfunction, such as dizziness, vertigo, nausea, vomiting, truncal ataxia, nystagmus, and dysarthria, appear first Next, the