| Findings: MRI of brain with T1 weighted echo train spin echo, T2 weighted
echo train spin echo, T2 weighted fluid-attenuated inversion
recovery echo train spin echo, MR diffusion imaging, T2 weighted
short inversion time inversion recovery echo train spin echo, and
without intravenous contrast: 1. Focal large amount cerebrospinal fluid accumulation in right
retrocerebellar space with mild across midline, may due to
large arachnoid cyst (figure 1).
2. Presence of mass effect of the above lesion with compression of
adjacent cerebellum and medulla oblongata, and suspicious
foramen of Magendie.
Downward displacement of cerebellar tonsil (1.3cm below foramen
magnum), suggesting tonsillar herniation (arrows in figure 2).
3. Marked dilatation of ventricles with stretched corpus callosum,
possibly associated with severe obstructive hydrocephalus from
compressed foramen of Magendie. Impression:
1. Right retrocerebellar large arachnoid cyst, suspicious tonsillar
herniation and severe obstructive hydrocephalus.
2. Recommendation: neurosurgery consultation. Thank you! |
080415 RETROCEREBELLAR LARGE ARACHNOID CYST
