Choroidal fissure cysts (CFCs) have been infrequently reported in the literature and, when described, are usually considered to be incidental findings of no clinical significance.[1,2]

A CFC refers to an intracranial cyst occurring at the level of the choroidal fissure.  The choroidal fissure is the narrow cleft along the medial wall of the lateral ventricle to which the choroid plexus is attached; it lies between the upper surface of the thalamus and lateral edge of the fornix in the central part of the ventricle and between the terminal stria and fimbria hippocampi in the inferior horn. [1] CFCs frequently represent either an arachnoid cyst, neuroglial cyst or a neuroepithelial cyst [3]. They are therefore a location based diagnosis rather than a distinct pathological entity.

The current consensus is that CFCs are almost always benign with interval imaging follow up unnecessary and no treatment required.[4]

We present a series of cases of antenatal ultrasound-detected cysts for which we have both antenatal and postnatal MRI along with the clinical outcome to date.