THE PSEUDO-CSF SIGNAL OF ORBITAL OPTIC GLIOMA ON MAGNETIC-RESONANCE-IMAGING - A SIGNATURE OF NEUROFIBROMATOSIS

A five-and-a-half-year-old boy with neurofibromatosis had bilateral or bital optic gliomas visible on magnetic resonance imaging. Both tumors displayed a double-intensity signal characterized by a circumferentia l area of CSF-intensity tissue surrounding and sharply delimited from a central linear core of opposite signal intensity. The peripheral CSF -intensity signal in orbital optic glioma correlates with the histopat hological finding of perineural arachnoidal gliomatosis and serves as a neuroradiologic marker for neurofibromatosis.