Subacute subdural hematoma
10 days history of headaches, diplopia, and weakness of the left upper limb and right lower limb.
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Crescent-shaped right frontoparietal subdural collection (thickness= 3 cm) of high signal intensity on T1WI, T2WI and FLAIR sequences is present, with internal septations of low signal, indicating a late subacute subdural hematoma (methemoglobin free). Note the mass effect on the midline structures with dilatation of the contralateral ventricular system.
MRI appearances of late subacute subdural hematoma (extracellular methemoglobin).