Trisomy 18 (Edwards)

Risk of recurrence after one affected child with a standard trisomy is 1% for a baby with some form of trisomy (trisomy 21 would be the most common)


Some differences between Trisomy 13 and 18

Trisomy 13 (Patau)
Trisomy 21 (Down)

CHLA board review course 2005
Baraitser and Winter, 1996. Color Atlas of Congenital Malformation Syndromes