Pre third ventriculostomy there is marked distention of the third ventricle with ballooning out of the recesses:
- supraoptic (orange arrow)
- infundibular (green arrow)
- pineal (red arrow)
Post third ventriculostomy has been performed with flow seen through the floor of the third ventricle (yellow arrow). Funnelling of the superior part of the aqueduct (blue arrow) is seen in keeping with aqueduct stenosis due to extrinsic compression.