Preoperative planning, without attaching fiducial markers. There is ill-defined low signal intensity lesion on the inferior aspect of tectal plate around the inferior colliculus.The lesion is measured about 8.6mm x 8.6mmGadolinium-enhanced images do not show any evidence of enhancement.Third ventricle and bilateral lateral ventricles are slightly enlarged likely represent hydrocephalus due to tectal lesion.The midline structures and cranial-cervical junction are normal. Normal flow voids are identified in the major intracranial vessels. The paranasal sinuses and mastoid air cells are clear.
Inferior tectal intraaxial mass without showing any evidence of contrast enhancement, 8.6mm x 8.6mm, associated with obstructive hydrocephalus as described above.These findings are indicative of tectal glioma.