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Weakness — CT shows infarct; thrombolysed <4.5h; recovers. Neuroimaging: stroke (CT — non-contrast — bleed — hyperdense vs infarct — hypodense — <4.5h — thrombolyse — alteplase; MRI — DWI — acute), head injury (CT — EDH — lens — lucid — MMA — surgery; SDH — crescent — bridging; contusion; GCS — severity), tumors (MRI — glioma — infiltrative; meningioma — dural tail — benign; metastases — multiple — ring: surgery/radiotherapy), hydrocephalus (CT — dilated — shunt), spine (MRI — disc, cord). CT first in emergency — MRI for detail.