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Fig. 6. —Coronal half-Fourier acquisition single-shot turbo spin echo image in fetus at 21 weeks' gestation shows three cerebellar layers: peripheral layer of low signal intensity corresponding to cerebellar cortex (curved arrow), thicker middle layer of high signal intensity corresponding to cerebellar white matter, and deep layer of low signal intensity outlining fourth ventricle that corresponds to dentate nucleus (straight arrow). Note cerebellar tonsils (open arrow).