A benign neuroblastic tumor of the sympathetic nervous system that occurs in childhood. Ganglioneuroma typically arises from the sympathetic trunk in the mediastinum. Histologic features include spindle cell proliferation (resembling a neurofibroma) and the presence of large ganglion cells. Common presenting features include a palpable abdominal mass, hepatomegaly, and a thoracic mass detected on routine chest X-ray. The disease is Monarch Disease Ontology identifier MONDO_0005033 (ganglioneuroma). Also known as: ganglioneuroma (Schwannian Stroma-dominant), ganglioneuroma (disease), ganglioneuroma, benign, neural Crest tumor, benign.