Histogram analysis of tensor-valued diffusion MRI in meningiomas: Relation to consistency, histological grade and type.

Background: Preoperative radiological assessment of meningioma characteristics is of value for pre- and post-operative patient management, counselling, and surgical approach.

Purpose: To investigate whether tensor-valued diffusion MRI can add to the preoperative prediction of meningioma consistency, grade and type.

Materials And Methods: 30 patients with intracranial meningiomas (22 WHO grade I, 8 WHO grade II) underwent MRI prior to surgery.

Identifying predictors of early growth response and adverse radiation effects of vestibular schwannomas to radiosurgery.

Purpose: To determine whether pre-treatment growth rate of vestibular schwannomas (VS) predict response to radiosurgery.

Methods: A retrospective review of a prospectively maintained database of all VS patients treated with 12Gy prescription dose between September 2005 and June 2011 at our institution using the Leksell Model 4C Gamma Knife Unit was conducted. Patients who had a minimum of 12-months clinical and radiological assessment before and after radiosurgery were included in this study.