thoracic benign neoplasm (MONDO_0000634, a Monarch Disease Ontology term) is a non-metastasizing neoplasm arising from any of the organs of the thoracic cavity. Representative examples include pleural adenomatoid tumor, chest wall lipoma, mediastinal schwannoma, and lung hamartoma. Also known as: benign neoplasm of the thorax, benign neoplasm of thorax, benign thoracic neoplasm, benign thoracic tumor, benign thoracic tumour, benign tumor of the thorax, benign tumor of thorax, benign tumour of the thorax.