Page 5 - SONO 260 Chapter 25 The Fetal Face and Neck
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Fetal Orbital Abnormalities
▪ Anophthalmia is the absence of the eye(s).
– It results from the failure of the optic vesicle to form and has been linked with multiple
abnormalities and chromosomal aberrations, including trisomy 13 and trisomy 18.
▪ An increased distance between the orbits is referred to as hypertelorism, a disorder more accurately diagnosed utilizing the interocular diameter.
– The most common cause of hypertelorism is the existence of an anterior cephalocele that displaces the orbits laterally.
