She complains of non-formed hallucinations in her left visual field a few times every week, consisting of flashing light phenomena, as well as occasional paresthesias of her left hand and face. She has undergone neuropsychological testing which demonstrates some inattention and some low performance on memory tests, as well as a deficit in peripheral memory. Visual field examination is notable for a left inferior quadrantanopsia. The remainder of the cranial nerve examination is normal. There is no upper extremity drift to distraction, and she is full strength in all extremities.
Sensation is intact to all modalities.
The patient does walk with a decreased left arm swing. In the center there is an area which could be solid tumor but does not enhance. The surrounding T2 abnormality extends to the posterior corpus callosum and the roof of the lateral ventricle. In comparision to prior imaging studies, the lesion has increased in size slightly since the previous studies. Figure 1a,b. T1 and T2 axial images of the lesion.