Gangliogliomas: ubiquitous or not?

In many publications, gangliogliomas are often referred to as “ubiquitous.” This term, meaning both “existing everywhere” or “constantly encountered,” is both correct and incorrect when referring to these tumors. Gangliogliomas may exist anywhere in the central nervous system, but are not commonly encountered. In this issue of the American Journal of Neuroradiology, two articles address the topic of gangliogliomas arising in the brain and spinal cord (1,2). The following are common issues raised regarding gangliogliomas.