"T1: 75% are isointense, 25% are hypointense 2"
"T2: >95% are hyperintense 2"
"heterogenous enhancement with areas of low signal is more characteristic of a neurofibroma"
"This article is an overview of spinal nerve sheath tumours. For a discussion on the epidemiology, clinical presentation, pathology and treatment/prognosis of spinal schwannomas and neurofibromas, please refer to spinal schwannoma and spinal neurofibroma."
"Schwannomas are frequently associated with haemorrhage, intrinsic vascular changes (thrombosis; sinusoidal dilatation), cyst formation and fatty degeneration. These findings are rare in neurofibromas 4."
"a hyperintense rim and central area of low signal resulting in a target sign may be seen in neurofibromas and occasionally also in schwannomas; this is thought to be due to a dense central area of collagenous stroma"
"CSF density on CT; CSF intensity on T1 and T2 weighted images"