 There is no new restricted diffusion.There is again prominence of the subarachnoid spaces and ventricles. The subdural collection on the right continues to extend along the frontal parietal lobes but has decreased in size. It previously measured 8 mm in thickness on prior MR, and now measures 4 mm at a similar level along the frontal lobe. Overall, the extra-axial space on the right appears similar to the prior CT, although direct comparison is difficult given the differences in exam technique and inability to differentiate subarachnoid from subdural space on CT.On the left there is an 12 mm crescentic collection containing T1 and T2 isointense material posteriorly as well as a component that is mildly bright on T1 and bright on T2 more superficially and anteriorly indicating blood products of different ages. There is a probable septation with susceptibility artifact along it as well as some susceptibility artifact dependently. When compared to the previous CT, inferring the size based on the subarachnoid vessels, the collection appears similar although it is slightly increased in thickness when compared to the previous MRI where it measured 10 mm in thickness.There are tracts of susceptibility artifact along the temporal and parietal lobes bilaterally in the locations of the previous subdural drains. In addition, there are small foci of susceptibility artifact for example along the right occipital horn and in the basal ganglia on the right.The ventricles and sulci are stable in size. The basal cisterns remain patent. There is no midline shift or mass effect. Normal flow-voids are demonstrated in the major intracranial vascular structures. The midline structures and craniocervical junction are within normal limits. The left middle ear and mastoid air cells were previously opacified but have now cleared. Myelination is appropriate for the patient's age.
Persistent bilateral subdural hematomas appear stable compared to the recent CT. When compared to the prior MRI the collection on the left has increased in thickness. There is evidence of septation and interval blood products. The subdural on the right is smaller compared to the previous MRI.