English: Distribution of Hemangioblastomas in the Central Nervous Systems of Study Patients

(A) Schematic representation of the distribution of CNS hemangioblastomas (red dots) in the 25 von Hippel-Lindau disease patients on MRI. Most (98%) of hemangioblastomas were found below the level of the tentorium in the cerebellum, brainstem, and spinal cord.

(B–D) Contrast-enhanced MRI demonstrating representative locations of hemangioblastomas including the cerebellum (B), brainstem (C) and spinal cord (D). (B) Axial view through the cerebellum demonstrating a hyperintense enhancing hemangioblastoma (arrow) with surrounding edema (hypointense area surrounding the tumor) that frequently is associated with these lesions. (C) Sagittal view through the posterior fossa demonstrating a hyperintense enhancing brainstem (medullary) hemangioblastoma (arrow) with surrounding edema. (D) Sagittal view through the thoracic and lumbar spinal cord demonstrating two hyperintense enhancing hemangioblastomas (arrows). The superior tumor is associated with a large intraspinal cyst (syrinx) that is common with these neoplasms (arrowhead)