obsolete_congenital anomaly of the great veins true Any abnormality, anatomical or biochemical, evident at birth or during the neonatal period and pertaining to any of the great veins (i.e. the two venae cavae and the four pulmonary veins). ICD10:Q26 MONDO:0018185 3.41.0 Replaced with Mondo term. Wikipedia:Great_veins http://purl.obolibrary.org/obo/MONDO_0018185