Fetal transient occipital bone protuberance during early pregnancy.
OBJECTIVE
To describe the prenatal sonographic findings and pregnancy outcome of fetuses with transient occipital bone protuberance (TOBP).


METHODS
Five fetuses with TOBP were identified at routine 14 to 15 weeks ultrasound. The sonographic examination was repeated during pregnancy and the neonates were examined after birth.


RESULTS
The occipital bone protuberance disappeared by 24 weeks in all five cases, and the postnatal examination of the skull was normal.


CONCLUSIONS
Isolated TOBP is rare during early pregnancy. Ultrasound follow-up is suggested and disappearance of the lesion can be expected in most, if not all the cases with normal skull at birth.
Nevo
Ori
O
Department of Obstetrics and Gynecology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada. ori.nevo@sunnybrook.ca
Bronshtein
Moshe
M
D005260:Female; D006801:Humans; D009777:Occipital Bone / Q000002:abnormalities / Q000000981:diagnostic imaging* / Q000196:embryology; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal