Why is this considered subdural hematoma?

[Jonari]

---

Members don't see this ad.

Source: http://library.tcmedc.org/webpath/radiol/cnsrad/brain015.htm

 

[Ycut]

First impression epidural 🙁
But from description and careful observation in first picture i see uneven surface of clot which forms as negative imprint from convexities of gyri
In epidural there is no such (lens shaped hematoma formed between two even surfaces periosteum and dura)


About second one i have no idea how to differentiate from epidural

 

[Zzmed]

It's subdural due to
1.) Its semilunar shaping (epidural: biconvex).
2.) The ''liquid'' inside has the same density as the brain (epidural: hyperintense-in acute phase).

The above post is true but not official...

 

[Rock13]

In the picture it looks pretty biconvex.

The density is in favour though. Although a subdural can also be hyperdense and acute, an epidural won't be chronic, so it can't be isodense (like in the picture).

 

[BigMotherKelly]

It crosses the left coronal suture.

 

[illegallysmooth]

It crosses the left coronal suture.

Yes. And it interdigitates with the gyri and sulci.

 

[MedicineMike]

It crosses the left coronal suture.

^this