Pathology J All paraganglia are composed of chief cells (type I cells, ie, chemoreceptive cells)and sustentacular cells(type l cells, ie, supporting cells). Developmentally, both types of cells are of neuroectodermal origin specifically, they arise from neural crest cells The vast majority of glomus tumors are benign and slow to grow with bone erosionPathology ◼ All paraganglia are composed of chief cells (type I cells, ie, chemoreceptive cells) and sustentacular cells (type II cells, ie, supporting cells). Developmentally, both types of cells are of neuroectodermal origin; specifically, they arise from neural crest cells ◼ The vast majority of glomus tumors are benign and slow to grow with bone erosion