... 105 clinical pearls, 109 complications, 108 considerations, 104 105 definition, 81diagnosis/prognosis, 106 107 etiologies, 105 106 grading system, 107 , 108 symptoms, 103 treatment options, 108 subarachnoid ... radiotherapy can ame-liorate symptoms. Small asymptomatic lesions in older patients can be observed.436 CASE FILES: NEUROLOGY LISTING OF CASES 451LISTING BY CASE NUMBER CASE NO. DISEASE CASE PAGE1 ... rule of 10% is associated with this tumor:approximately 10% of these tumors produce a catecholamine-like sub-stance, approximately10% of these tumors are bilateral, approxi-mately10% are familial,...