Disease Summary help help Associated Targets (4)Tbio3Tchem1 Explore Associated Targets list GARD Rare open_in_new Mondo Description Caudal regression sequence is a rare congenital malformation of the lower spinal segments associated with aplasia or hypoplasia of the sacrum and lumbar spine. Mondo Term and Equivalent IDs MONDO:0017607: caudal regression sequence GARD:0006007: open_in_newNCIT:C124505: open_in_newOrphanet:3027: UMLS:C1838568: open_in_newUMLS:C1867774: open_in_new