Imaging features on the CT and MRI depicts the appearance of a subacute intracranial haemorrhage.
Peripheral enhancement detected on both contrast enhanced CT and post contrast T1 is typically appreciated in subacute stage of intracranial haemorrphage which can persist for several months.
Subtle mass effect can again be appreciated on the FLAIR image. There is no surrounding vasogenic oedema which is another clue to the subacute nature of this haematoma.
In the late subacute phase, the haematoma contains predominately of extracellular methaemoglobin. This correlate with increase signal intensity on both T1 and T2. Peripheral T2 shortening and rimmed hypointensity on SWI corresponds to deposition of haemosiderin and ferritin. As the haematoma progress into the the chronic phase there will be progressive increase in low signal rim.