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Ultrafast MR Imaging of the Normal Posterior Fossa in Fetuses

Madelyn M. Stazzone1, Anne M. Hubbard, Larissa T. Bilaniuk, M. Patricia Harty, James S. Meyer, Robert A. Zimmerman and Soroosh Mahboubi

1 All authors: Department of Radiology, Children's Hospital of Philadelphia, 34th and Civic Center Blvd., Philadelphia, PA 19154.



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  		Fig. 1. —Sagittal half-Fourier acquisition single-shot turbo spin-echo image of brain of fetus at 18 weeks' gestation clearly shows inferior vermis (arrow).

 


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  		Fig. 2. —Semiaxial half-Fourier acquisition single-shot turbo spin-echo image in fetus at 25 weeks' gestation shows normal cerebellar hemispheres, normal cisterna magna (solid arrow), normal fourth ventricle (arrowhead), and normal vermis (open arrow).

 


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  		Fig. 3. —Sagittal half-Fourier acquisition single-shot turbo spin-echo image of fetus at 21 weeks' gestation shows peripheral low signal intensity in cerebellar hemisphere (thick arrow). Note low signal intensity in region of tectum (thin arrow) and in posterior aspect of pons and medulla.

 


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  		Fig. 4A. —A fetus at 32 weeks' gestation. Sagittal half-Fourier acquisition single-shot turbo spin-echo (HASTE) image shows well-developed cerebellar hemisphere with notable folia. Arrow indicates midbrain.

 


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  		Fig. 4B. —A fetus at 32 weeks' gestation. Semiaxial HASTE image shows that posterior band of low signal intensity along brainstem has now reached mid brain (arrow).

 


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  		Fig. 5. —Axial half-Fourier acquisition single-shot turbo spin-echo image in fetus at 21 weeks' gestation shows early folial pattern with alternating layers of intermediate to low- (short arrow) and high-signal-intensity bands (long arrow).

 


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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).

 


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  		Fig. 7. —Axial half-Fourier acquisition single-shot turbo spin-echo image of brain of fetus at 25 weeks' gestation clearly shows middle cerebellar peduncles as bilateral bands of low signal intensity extending from pons to cerebellar hemispheres (arrows).

 

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