title
home divider head and neck divider brain divider face divider spine divider chest divider abdomen divider genitourinary divider extremities
Diamniotic Dichorionic Twin Membranes
toggle
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 b a
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    
T1-weighted image demonstrates 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.