Presentation
Unilateral ventriculomegaly on obstetric ultrasound.
Patient Data
There is mild unilateral lateral ventricular enlargement. No other abnormality was detected in the fetal brain or body (body imaging not shown).
Note the features of normal sulcation for this gestation. New sulci and gyri are developing immediately anterior and posterior to central sulcus. The cingulate sulcus is now visible but superior temporal sulcus not yet seen. The insular cortex is covered further by the temporal lobe as opercularization progresses.
Normal development at 28 weeks
Normal sulcation and operculisation.
Operculisation
Further covering of the insular cortex by the temporal lobe.
Sulcation
First image: the precentral and postcentral sulci (dotted arrows) are now present on either side of the central sulcus (solid arrow).
Middle image: further development of the cingulate fissure (straight arrows) and collateral sulcus (curved arrow).
Last image: cingulate fissure (dotted line) is in this case well seen on the sagittal series, with continuation into the marginal sulcus (curved arrow). The parieto-occipital (straight arrow) and calcarine (dotted arrow) fissures are also well depicted on this slice.