Interhemispheric Supratentorial Cysts

Andrea Sciarrone
2020 Donald School Journal of Ultrasound in Obstetrics and Gynecology  
Interhemispheric supratentorial cystic-like fluid collections may be occasional findings occurring during the routine second trimester ultrasound screening. The correct diagnosis of the origin of the cyst is necessary for an adequate counseling: In most cases, the cyst is a benign finding but sometimes it can be the sign of a serious abnormality with neurological sequelae. They may be located from the anterior to the posterior aspect of the brain in three regions: (1) the area of the anterior
more » ... a of the anterior complex [cavum septi pellucidi (CSP)]/cavum vergae (CV), frontal horns of the lateral ventricles, genu of the corpus callosum (GCC); (2) the intermediate zone (thalami and third ventricle); (3) the area of the posterior complex [arachnoidal space delimited by the medial walls of the occipital lobes and the splenium of the corpus callosum (CC)]. Cysts of the anterior complex include dilatation of the CSP/CV and agenesis of septum pellucidum (ASP). A cystic structure in the intermediate zone may be due to dilatation of the third ventricle in case of aqueductal stenosis (AS) or agenesis of the corpus callosum (ACC). Interhemispheric cysts located in the area of the posterior complex are arachnoidal cysts originating from the cavum veli interpositi, the quadrigeminal and suprasellar cisterns. In order to define the correct location and consequent clinical significance of the cyst, a complete neurosonogram is needed with the midsagittal view being the most informative plane.
doi:10.5005/jp-journals-10009-1655 fatcat:wxty2waiffhibi37pauopjnvz4