MRI at Children's Hospital
August 31, 2007
Pontocerebellar hypoplasia and agenesis of corpus callosum.
Mild to Moderate ventriculomegaly. Doubtful to represent hydrocephalus, given cerebral volume loss. Correlation with the head circumference is however, helpful.
Technique: Sagittal T1; axial long TR double-echo, T1, and diffusion; and coronal fast spin-echo T2.
History: Absence of corpus callosum, colpocephaly, mild hydrocephalus.
Findings: The brainstem is small in size. These is absence of the inferior vermis. The cerebellar hemispheres are mildly hypoplastic in appearance. The optic chiasm is small in size. The pituitary gland is unremarkable.
There is moderate to marked cerebral white matter volume loss, more conspicuous posteriorly. Linear band of tissue is noted crossing the frontal horn of the lateral ventricles. These may represent adhesive tissue from prior hemorrhage and/or an infectious process.
Mild cortical irregularity of the right frontal operculum and bilateral sylvian fissures, suggestive of polymicrogyria, is demonstrated. There is very simplified gyral pattern of the occipital lobes. There is associated gray-white matter interface. The latter finding may represent focal pachygyria, rather than polymicrogyria.
There is poor visualization of the internal capsule, suggestive of the delayed myelination. There is no intracranial hemorrhage or evidence of acute ischemic event.
Two parallel and small in length linear areas of flow void signal are seen at the proximal basilar artery, consistent with fenestration.