Where is a subdural hematoma located?
A subdural hematoma is a type of bleed inside your head. More precisely, it is a type of bleed that occurs within the skull of head but outside the actual brain tissue. The brain has three membranes layers or coverings (called meninges) that lay between the bony skull and the actual brain tissue.
Is subdural hematoma venous or arterial?
Subdural hematomas are usually of venous origin and progress slowly, as opposed to epidural hematomas that are of arterial origin and may reach maximum size within minutes. On the patient’s right side, cortical atrophy results in diffusely thin gyri and widened sulci.
What causes chronic hypodense hematoma?
Chronic Subdural Hematoma (> 3 weeks old) As the blood clot further liquefies, the subdural appears hypodense by CT imaging and reaches close to fluid density of cerebrospinal fluid within the cortical sulci/ventricles thus reaching the chronic stage (hygroma).
How does a subdural hematoma occur?
A subdural haematoma occurs when a blood vessel in the space between the skull and the brain (the subdural space) is damaged. Blood escapes from the blood vessel, leading to the formation of a blood clot (haematoma) that places pressure on the brain and damages it.
Which vessel is ruptured in subdural hematoma?
Most acute subdural hematomas (ASDHs) develop after rupture of a bridging vein or veins. The anatomy of the bridging vein predisposes to its tearing within the border cell layer of the dura mater.
What is hypodense in CT scan?
The appearance of tissues on a CT scan is described in terms of ‘density’. Darker structures are ‘hypodense or low density’; brighter structures are ‘hyperdense or high density’. Blood Can Be Very Bad is a mnemonic that can be used when faced with interpreting a CT head scan: Blood. Cisterns.
What appears hyperdense in CT?
Hyper/hypodenisty – blood, calcification and IV contrast are hyperdense (appear lighter) and air, fat and areas of tumor ischemia are hypodense (appear darker).
Can you have a subdural hematoma without trauma?
Some subdural hematomas occur without cause (spontaneously). The following increase the risk for a subdural hematoma: Medicines that thin the blood (such as warfarin or aspirin) Long-term alcohol use.