Hi Lena,
What a classic case,
I don’t think you can tell the difference between an acute haematoma and a Morel Lavallee lesion at this stage.
They would look the same,
BUT,
With that history of acute shearing trauma and that location over the lateral hip it would be a classic Morel Lavallee lesion.
I would describe that as an acute haematoma, but given the history and location suggest that a Morel Lavallee lesion may persist.
The difference will be in the follow up,
If it is a simple haematoma it will resolve quickly,
If it is a Morel Lavallee lesion it will persist and be very recalcitrant.
Now if you ask my opinion as to the most likely outcome I would say with the location and history we will be seeing a Morel Lavallee lesion that will persist !
Time will tell.
My worksheet would describe it as an acute haematoma but given the classic location and history of shearing trauma a Morel Lavallee lesion needs to be a serious consideration.
Please let us know what transpires.
Happy scanning,
Steve