Biopsy of fetal tissues is a relatively new procedure for the diagnosi
s of congenital malformations. The authors report the first case in wh
ich this technique has been applied to an orbital mass, in which heter
otopic brain tissue was diagnosed by prenatal biopsy and excised in in
fancy. The wider implications of such intrauterine procedures are disc
ussed. Copyright (C) 1997 by W.B. Saunders Company.