Critical Findings in Brain CT Scan Interpretation

Distinguishing Features on Non-Contrast CT

Hemorrhagic tumor with vasogenic edema shows heterogeneous density with areas of hemorrhage within a mass lesion, surrounding hypodense vasogenic edema extends along white matter tracts, and mass effect with midline shift may be present, according to the American College of Radiology 1, 2
Intracerebral hemorrhage (amyloid angiopathy) appears as homogeneous hyperdense intraparenchymal blood within brain tissue, typically lobar location in elderly patients with amyloid angiopathy, and may have surrounding hypodense edema, as reported by the International Journal of Stroke 3
Ischemic stroke with hemorrhagic transformation shows hyperdense areas within a hypodense ischemic territory, loss of gray-white differentiation in the affected vascular territory, and petechial hemorrhage appears as scattered hyperdensities within the infarct zone, according to the International Journal of Stroke 3

Hyperdense blood in the subarachnoid spaces, particularly basal cisterns, sylvian fissures, and sulci, represents a catastrophic neurosurgical emergency with >40% mortality within 30 days, and requires immediate neurosurgical consultation and vascular imaging (CTA or catheter angiography) to identify aneurysm, as stated by the International Journal of Stroke 4
Patients should undergo non-contrast CT immediately on arrival to confirm diagnosis, and high early risk for rebleeding; assessment must occur without delay, according to the International Journal of Stroke 4

All patients with suspected acute stroke or head trauma should undergo immediate non-contrast CT, as recommended by the International Journal of Stroke and the American College of Radiology 1, 2, 3, 5
CT is highly sensitive for detecting findings requiring neurosurgical intervention, according to the American College of Radiology 1, 2

Do not delay CT imaging to obtain laboratory results if patient is stable for transport, and do not rely on clinical characteristics alone to distinguish hemorrhage from ischemia—neuroimaging is mandatory, as advised by Praxis Medical Insights 5
Avoid hypotension and hypoxia, which worsen secondary brain injury, and for traumatic brain injury, maintain systolic blood pressure >100 mmHg or mean arterial pressure >80 mmHg, as recommended by Praxis Medical Insights 5, 6, 7

Patients with subarachnoid hemorrhage should be started on nimodipine within 96 hours if adequate blood pressure, continued for 14-21 days, and vascular imaging (CTA or catheter angiography) is required to identify aneurysm source, as stated by the International Journal of Stroke 4
Transfer to tertiary center with neurosurgical expertise for ongoing management is recommended for patients with subarachnoid hemorrhage, according to the International Journal of Stroke 4