goldensilikon.blogg.se - Which is right and left on sagittal ct

Quadrigeminal-located at the top of the midbrain.Suprasellar-around the circle of Willis.

Examine each for evidence of effacement, asymmetry and the presence of blood. Cisterns are collections of CSF, which surround and protect the brain.Intraventricular haemorrhage (IVH) – usually associated with significant trauma.Intracerebral haemorrhage (ICH) – secondary to trauma, hypertension and haemorrhagic stroke.Intracerebral (axial) haemorrhage occurring within the brain itself.Subarachnoid haemorrhage (SAH) – haemorrhage into the CSF and cisterns secondary to aneurysms, trauma and arteriovenous malformation.Subdural haemorrhage (SDH) – crescent-shaped blood collection that can cross suture lines usually secondary to venous disruption of surface and/or bridging vessels.Extradural haemorrhage (EDH) – biconvex lesion that does not cross suture lines usually secondary to arterial injury.Extracerebral (axial) haemorrhage occurring within the skull, but outside the brain.As the clot retracts it becomes more hyperdense over the first few hours up to 7 days then isodense with brain over the following 1-4 weeks and finally hypodense compared with brain over the subsequent 4-6 weeks.

Acute haemorrhage absorbs X-rays and appears hyperdense (white) on CT scans.

Clues to the origin of the haemorrhage, its duration and the cause of the insult may be indicated by its position and spread.

Generate a system to review all the essential features of the CT head scan.

IV contrast does not cross the normal blood brain barrier and is used if there is a suspicion of tumour, infection (e.g.

Determine if scans have been taken with or without IV contrast, as contrast may mimic the presence of blood.

The CT slice is regarded as being viewed from the patient’s feet, so the left side of the picture as you view it is the right side of the patient.

Use a systematic approach to viewing the anatomical structures in the many slices prepared by the CT scanner.