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Fig. 4C. MRI of twins at 29 weeks' gestation with meconium peritonitis
in twin B secondary to small-bowel atresia. Twin B did not have cystic
fibrosis. T1-weighted image of both twins A and B shows twin A to have several
normal-appearing loops of colon (+) with increased signal intensity and
decreased signal intensity in bladder (B). Twin B is noted to have ascites
(arrows), which is intermediate in signal intensity; no
normal-appearing bright loops of colon are identified in twin B.