Endoscopic 3rd ventriculostomy for hydrocephalus/aqueduct stenosis due to tectal glioma: yearly follow up. There has been apparent slight interval increase in size and degree of enhancement of the exophytic nodular portion of the tumor within the posterior third ventricle, which now measures 16 x 12 mm, previously 14 x 10 mm. Otherwise, there is no significant change in the ill-defined portion of the tumor within the left thalamus that contains associated susceptibility effect and intrinsic T1 hyperintensity likely related to prior hemorrhage, which measures approximately 20 x 15 mm. The third ventriculostomy appears to be patent, as evidenced by the presence of a robust jet of cerebrospinal fluid into the third ventricle. There is no significant interval change in the degree of bilateral lateral and anterior third ventricular dilatation with a right transfrontal shunt catheter in position. Likewise, effacement of the superior aspect of the cerebral aqueduct persists and the fourth ventricle appears unchanged in size. There is no evidence of acute infarction. The major cerebrovascular flow voids appears to be grossly intact. The skull, paranasal sinuses, mastoid air cells, scalp, and orbits appear unchanged.
1. Apparent slight interval increase in size and enhancement of the exophytic nodular component of the glioma within the third ventricle, but no significant change of the left thalamic portion of the tumor.2. Patent third ventriculostomy, but persistent dilatation of the shunted bilateral lateral and anterior third ventricles. 