obsolete_Askin Tumor true UMLS:C0877849 A primitive neuroectodermal tumor (small round blue cell tumor) of the thorax which can involve the periosteum, thoracic wall and/or pleura though it spares the lung parenchyma. ICDO:9365/3 Editor note: in DO this is classified as Ewing sarcoma but we follow NCIT in placing as sibling Askin tumor DOID:0050608 PNET of thoracopulmonary region NCIT:C7542 EFO:1000095 http://purl.obolibrary.org/obo/MONDO_0006094 peripheral neuroectodermal tumor of thoracopulmonary region Askin's tumor small cell tumor of thoracopulmonary region Replaced by Mondo term MONDO_0006094, with which this term was previously merged. Use: http://purl.obolibrary.org/obo/MONDO_0006094 3.88.0