FETAL MOUSTACHE IN EARLY-PREGNANCY

Objective The aim of this study was to determine the incidence in an u nselected population of a rod-like structure on the fetal upper lip (c alled a 'mustache') which we had previously observed as an incidental finding. A secondary aim was to determine whether this was associated with any abnormalities or abnormal outcomes. Design Prospective non-ra ndomized study. Subjects Three thousand consecutive fetuses from an un selected population were scanned by one sonologist. Method Transvagina l ultrasound examinations were performed at 14-16 weeks' gestation. Re peat sonographic examinations were performed at 20-22 weeks' gestation in cases where a mustache was detected, and these neonates were exami ned by a pediatrician after delivery. Results Seven of 3000 fetuses ha d a mustache-like structure on the upper lip. The 'mustache' disappear ed laser in gestation. No anomaly of the upper lip was detected after birth in these fetuses. Conclusion A mustache-like structure on the fe tal upper lip in early pregnancy probably represents a normal variant of lip development. It is likely to represent a delay in the normal pr ocess of lip fusion during embryonic life.