Ganglioneuroma (occasionally called a "ganglioma") is a rare and benign tumor of the autonomic nerve fibers arising from neural crest sympathogonia (undifferentiated cells of the sympathetic nervous system).

Other common locations include the adrenal gland, paraspinal retroperitoneum, posterior mediastinum, head, and neck.

[1] It is contained within the neuroblastic tumors group, which includes:[3] Ganglioneuroma (benign), Ganglioneuroblastoma (intermediate), Neuroblastoma (aggressive).

[4] These tumors may produce certain hormones, which can cause diarrhea, an enlarged clitoris (in females), high blood pressure, increased body hair, and sweating.

[citation needed] If there are symptoms or major physical deformity, treatment usually consists of surgery to remove the tumor.