This tumor is thought to be derived from the parenchymal cells of the posterior lobe of the pituitary gland, called pituicytes. Some researchers believe that they arise from the folliculostellate cells in the anterior lobe of the pituitary. As such, it is a low-grade glioma.
This tumor is hypothesized to originate from the pituicyte cells within the posterior lobe of the pituitary gland, which are similar to folliculostellate cells in the anterior lobe. Therefore, it is a type of low-grade glioma.