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Diamniotic Dichorionic Twin Membranes
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18 weeks a b  
  Dichorionic diamniotic twins in the second trimester. Note the thick dividing membrane (arrow) and the two placentas (P1, P2).  
20 weeks b    
At 20 weeks gestation, the membrane is still clearly visible. Due to partial volume averaging, the sheet of membrane can be seen in two places (arrows).    
b b  
T1-weighted images also demonstrate the dichorionic diamniotic twin membrane (arrow).  
26 weeks a    
  Later in gestation, the twin membrane (arrow) is more difficult to visualize.    
27 weeks a b  
  Later in gestation, the twin membrane (arrow) is more difficult to visualize.  
28 weeks a    
  Later in gestation, the twin membrane (arrow) is more difficult to visualize.