Location of the tumor determines other symptoms and signs, for example Cerebellum: Weakness, tremor, and ataxia Cerebral hemispheres: Weakness, numbness, or seizures Visual pathway: Visual loss, proptosis, or nystagmus Spinal cord: Pain, weakness, and gait disturbance Diagnosis of Astrocytomas Contrast-enhanced MRI Biopsy Contrast-enhanced MRI is the imaging test of choice for diagnosing the tumor, determining extent of disease, and detecting recurrence.