18 year-old male with sickle cell crisis and severe headache There is no evidence of intracranial hemorrhage, mass or edema. Crowding of the foramen magnum with the cerebellar tonsils extending inferiorly off the image corresponding to a Chiari 1 malformation as seen on the previous MRI.There is a subtle hypoattenuation in the region of the right external capsule, also seen on the previous MRI without surrounding gliosis or edema, and appears to represent prominent CSF space.The ventricles and basal cisterns are normal in size and configuration.The calvaria and skull base are radiographically normal. The visualized paranasal sinuses and mastoid air cells are normally pneumatized.
No acute intracranial abnormality. Chiari 1 malformation is again noted.