|Tour 1: Next/Previous/Start:
This tour will examine the left parietal lesion, found at biopsy to be an
anaplastic astrocytoma. First, note that the T2-weighted image shows a
poorly circumscribed mass with a core of mixed high and low signal, a
rounded periphery of higher signal, and a component of infiltrating edema,
appearing as somewhat lower signal. The tumor appears to be centered in
white matter underlying the left post-central gyrus.