Of the 5 liveborn infants with the hernia of Morgagni recorded in the
California Birth Defects Monitoring Program, 3 had trisomy 21. This si
gnificant association (P < 10(-6)) between the hernia of Morgagni and
trisomy 21 may reflect defective dorsoventral migration of rhabdomyobl
asts from the paraxial myotomes, caused by increased cellular adhesive
ness in trisomy 21. (C) 1993 Wiley-Liss, Inc.