16-year-old male with a cystic astrocytoma There is an 11 x 23 mm axial dimension nonenhancing mass located at the medial aspect of the right temporal lobe which is homogeneously high signal on T2 and homogeneously low signal on T1. It previously measured 12 x 23 mm. It displaces the right posterior communicating artery medially, protrudes into the suprasellar cistern along its posterior aspect, is within a millimeter of the infundibulum of the pituitary gland, impresses upon the right cerebral peduncle, and also displaces the basal vein of Rosenthal superiorly. Normal vascular flow voids are present in the distal carotid and vertebral arteries, the basilar artery and the proximal anterior, middle and posterior cerebral arteries as well as the internal cerebral veins and superior sagittal sinus. Subtle changes from previous right frontal approach biopsy are again noted. Ventricular sizes are stable without dilatation or hydrocephalus. The visualized portions of the paranasal sinuses are clear. The visualized portions of the mastoid air cells are clear. The visualized portions of the orbits are intact.
Minimal decrease in size of a nonenhancing right medial temporal lobe mass.