Antenatal CNS imaging
Of the 81 included pregnancies, the local reporter was unable to confirm whether antenatal CNS imaging had occurred in 6 cases. In the remaining 75 cases, antenatal CNS imaging was performed in 46/75 (61%) surviving co-twins. Of the 46 cases that underwent imaging, 36 had ultrasound assessment alone, 52 had fetal MRI in addition to USS. The results of at least one imaging modality was known by the UKOSS reporter in 33/46 cases. Abnormal CNS imaging was reported antenatally in 7/33 (21%) surviving co-twins, in 3 cases the abnormality was confirmed on fetal MRI, in all 7 cases the imaging abnormalities were of a severity known to be associated with neurological sequelae.