Radiology MRI

Non enhanced CT showing little Colloid Cyst (CC) that has characteristic hyperdense appearance and location. This CC is located slightly posteriorly to the foramina of Monro and not causing obstructive hydrocephalus. Note open foramina of Monro on the lower set of images. The ventricular system is dilated however, that is most likely due to central atrophy. Note also general cortical atrophy supra- and infratentorial.

Patient with proximal right Vertebral Artery (VA) dissection. VA is occluded from origin till C5 level (arrowhead on last image). Patient suffered from right cerebellar and left occipital infarct. Right VA is dominant (as anatomical variant) since left VA ends in Posterior Inferior Cerebellar Artery (PICA). Note on those 3D reconstructions the collateral circulation. First two images show Deep Cervical Artery branch that originates from Costocervical Trunk and enters VA cranial to C1 arch (arrow). Third and fourth images show another collateral: Ascending Cervical Artery that originates from Thyrocervical Trunk and enters VA through the vertebral foramen at the level of C2-3 (long arrow on last image).

Surface reconstruction image from CTA showing both ophthalmic arteries and intra-orbital structures (shaded in blue). Nice for viewing anatomy and from aesthetic perspective. There is also some diagnostic value in such reconstructions as it seems easier to find vascular anomalies and present those to clinical doctors. Oh, and images look much better in motion due to 3D effect.