Fetal ultrasound soft marker Fetal choroid plexus cysts 2012-03-17T06:59:50Z There is agreement that ultrasound characteristics of CPC, such as bilaterality, size, number, complexity, and resolution, are not related to the risk of aneuploidy. However, cysts with diameters less than 5 mm may not be linked with trisomy and large cysts in excess of 10 mm may impart a higher risk. SNOMEDCT_US:462165005 HP:0011426 Fetal choroid plexus cysts (CPCs) are sonographically discrete, small cysts found in the choroid plexus within the lateral cerebral ventricles of the developing fetus at 14 to 24 weeks gestation. Imaging of the choroid plexus is performed in the transverse plane of the fetal head at the same level that the lateral cerebral ventricle is evaluated. The choroid plexus should be inspected bilaterally for the presence of cysts. The size of CPCs is not of clinical relevance (PMID:16100637). UMLS:C3532166 Foetal choroid plexus cysts Abnormal fetal central nervous system morphology