 There is a complex abnormality involving the left hemisphere. The posterior aspect of the left thalamus, as well as the overall left occipital lobe, is asymmetrically larger than the right, associated with a right paramedian location of the torcular Herophili. Additionally, there is a loss of normal gyration involving the posterior mesial temporal lobe near its junction with the left occipital lobe associated with a more parallel course of the left lateral ventricular atria and occipital horn as well as the leftward corpus callosal splenium. There is overall enlargement of the entire left lateral ventricle compared to right with a suggestion of adjacent white matter thinning. These findings are not associated with specific signal intensity abnormality nor susceptibility abnormality. The degree of myelination is appropriate for age bilaterally.Tonsillar ectopia is present measuring 5 mm demonstrating a slightly pointed configuration suggestive of Chiari I malformation.There are no masses. The pituitary gland is normal in size for age. There is no evidence for intracranial hemorrhage or acute cerebral, brainstem or cerebellar infarction. No diffusion-weighted abnormalities are identified. There are no extraaxial fluid collections or subdural hematomas. Flow voids are present within the major vessels indicating patency. The paranasal sinuses and mastoid air cells are clear. There is no abnormal enhancement within the brain.
1.There is a complex abnormality involving the left hemisphere. The posterior aspect of the left thalamus, as well as the overall left occipital lobe, is asymmetrically larger than the right, associated with a right paramedian location of the torcular Herophili. Additionally, there is a loss of normal gyration involving the posterior mesial temporal lobe near its junction with the left occipital lobe associated with a more parallel course of the left lateral ventricular atria and occipital horn as well as the leftward corpus callosal splenium. There is overall enlargement of the entire left lateral ventricle compared to right with a suggestion of adjacent white matter thinning. These findings are not associated with specific signal intensity abnormality nor susceptibility abnormality. The degree of myelination is appropriate for age bilaterally.2.Tonsillar ectopia is present measuring 5 mm demonstrating a slightly pointed configuration suggestive of Chiari I malformation.