A and B, Coronal and axial single-shot [SS]-FSE T2-weighted sections of a 21 weeks' GA fetus show unilateral cavitation of the GE (arrows). Brain size was normal, and no associated anomalies were found. C and D, Coronal and axial SS-FSE T2-weighted sections of another 21 weeks' GA fetus show unilateral cavitation of the GE (arrows). Head size was normal, but an ipsilateral temporal-occipital large polymicrogyric area was found. E and F, A GA-matched control.