RT Journal Article SR Electronic T1 Prenatal diagnosis of cervical ribs by three-dimensional ultrasound in a foetus with a herniated Dandy-Walker cyst JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e225381 DO 10.1136/bcr-2018-225381 VO 11 IS 1 A1 Pauline Schut A1 Robert M Verdijk A1 Marieke Joosten A1 Alex J Eggink YR 2018 UL http://casereports.bmj.com/content/11/1/e225381.abstract AB We present a case report of a foetus with a herniated Dandy-Walker cyst and bilateral rudimentary cervical ribs. The cervical ribs were visualised prenatally by three-dimensional ultrasound and confirmed by post-termination radiography. The prevalence of cervical ribs is higher in deceased fetuses and neonates with or without structural abnormalities compared with healthy individuals and might be regarded as a marker of disadvantageous fetal development. We demonstrate that evaluation of the fetal vertebral pattern by three-dimensional ultrasonography, including the cervical region, is feasible and could provide valuable information regarding fetal and neonatal prognosis.