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Orbit Pathology
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hypotelorism
a b  
A 20 week fetus with hypotelorism and alobar holoprosencephaly.  
c d  
A 17 week fetus with hypotelorism and holoprosencephaly.  
hypertelorism
c c c
A 22 week fetus with hypertelorism. This fetus also had an arachnoid cyst.
c d  
A 33 week fetus with hypertelorism, an intracranial cyst (c), cleft lip and palate (arrow) and agenesis of the corpus callosum.  
microtia and orbital encephalocele
a b a
Sonograms of a 33 week fetus with orbital encephalocele. Left orbit is disrupted by encephalocele (arrow). Right orbit exhibits microtia. Encephalocele of left frontal lobe resulting in protruding orbit. Note dysgenetic brain and severely sloping forehead.
b a  
In the coronal plane, neural tissue is visible protruding from left orbit.  
a b a
Sagittal, coronal, and axial views demonstrate severely dysgenetic brain.
c d  
Protrusion of frontal lobe through calveric defect results in dysmorphic left orbit of this 35 week fetus. Sagittal view demonstrates prominent orbits.  
d d  
Frontal lobe is entrapped by encephalocele, making neural tissue clearly visible outside the cranium, anterior to midface (arrow).  
d d  
Postnatal preoperative photograph and post-operative MRI demonstrate frontal encephalocele.