History of Chiari malformation, acute trauma 2 days prior, altered mental status, unclear cause. Evaluate for swelling, etc. Examination is motion degraded on multiple sequences. The brain parenchyma appears within normal limits. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. Mild tonsillar ectopia is again seen without significant crowding at the foramen magnum. There is a partially empty sella as seen on the prior MRI. There is no abnormal intracranial enhancement. There is a mildly calcified ovoid lesion in the left parietal scalp with low T1 and T2 signal which may represent a benign scalp lesion such as a sebaceous cyst and can be correlated with clinical findings.
1. Mild cerebellar tonsillar ectopia is again seen without significant crowding at the foramen magnum. Brain parenchyma appears otherwise within normal limits. Specifically, no evidence of traumatic injury.2. Left parietal scalp lesion which may represent a benign scalp lesion such as a sebaceous cyst and can be correlated with examination.