How does an extradural hematoma appear on CT?

CT. In almost all cases, extradural hematomas are seen on CT scans of the brain. They are typically bi-convex (or lentiform) in shape, and most frequently beneath the squamous part of the temporal bone. EDHs are hyperdense, somewhat heterogeneous, and sharply demarcated.

How do you tell the difference between SDH and EDH?

EDH is treated with expedient evacuation via a craniotomy. SDH has various management strategies depending on the size, location and extent of mass effect and is either conservative (monitor with serial CT) or surgical (drainage with burr holes).

What is the difference between epidural and subdural hematoma on CT?

An epidural hematoma lies outside (on top) of the dura mater (epi is Greek for upon), while a subdural hematoma lies inside (beneath) the dura mater (sub is Greek for below) and outside the arachnoid mater. A third kind of hematoma caused by head injuries is traumatic intracerebral hemorrhage.

What does crossing suture lines mean?

Cross suture lines since bleeding is below the dura, which is tightly attached to the calvarium, thus giving the “crescent shape” appearance on head CT. Can result in mass effect leading to uncal and/or tonsillar herniation if left untreated.

What is the difference between extradural and subdural hematoma?

Extradural haematoma (EDH) is a blood clot that forms on the outside of the natural covering of the brain (‘dura mater’), while acute subdural haematoma (ASDH) refers to a blood clot on the inner surface of the dura that appears within the first few days of head injury.

Which is worse SDH or EDH?

SDH may be more extensive than EDH. Blood spreads over the hemisphere. Brain damage after head injury can be classified by its time course.

Why is epidural hematoma lens shaped?

The high pressure of the blood coming from the arterial circulation causes the dura mater to separate from the skull, creating the classic lens-shaped hematoma that can expand quickly, placing significant pressure on the brain.

Why does epidural hematoma not cross suture lines?

Epidural hematomas occur when an artery is injured and arterial blood accumulates between the dura and the calvarium. Do not cross suture lines because of the tight adherence of the dura to the calvarium and thus have a biconvex or elliptical appearance.