Headache.IMAGE ACQUISITIONS: 5-mm contiguous axial images of the brain without contrast infusion. Low-attenuation lesion in the peripheral aspect of right cerebellar hemisphere or in the extra-axial space adjacent to the right cerebellar hemisphere measures approximately 19 x 12 mm transverse by AP. This could represent an arachnoid cyst but is in an atypical location for arachnoid cyst. Consider follow-up MRI of the brain before and after gadolinium to definitively exclude cystic mass.There are moderate chronic ischemic/degenerative changes of cerebral white matter. There is no hydrocephalus. There are no subdural fluid collections. Left parieto-occipital scalp swelling is noted. There is no depressed calvarial fracture.
1.No acute intracranial hemorrhage.2.Moderate chronic ischemic/degenerative changes.3.Posterior fossa cystic appearing lesion. Consider MRI for further evaluation.