Newborn with a brain cyst on prenatal ultrasound

MRI of intraventricular simple cyst
Axial (above left) and coronal (above right) T2 MRI and sagittal T1 MRI without contrast (below) of the brain show a thin walled round structure without septations in the posterior horn of the right lateral ventricle that follows cerebrospinal fluid signal characteristics on all MRI sequences.

The diagnosis was intraventricular simple cyst.