Table 1.
Cranial fossa | T18 Cranial fossae shifted anteriorly |
---|---|
Anterior cranial fossa | |
Sphenoid bone | |
Lesser wing | Absent on right side, reduced on left side |
Ethmoid bone | |
Crista galli | Absent |
Cribriform plate | Absent |
Orbital part of the frontal bone (forms roof of orbit) | Absent |
Middle cranial fossa | |
Sphenoid bone | |
Superior orbital fissure | Present on left side, absent on right |
Hypophyseal fossa | Cartilaginous, incomplete |
Anterior clinoid process | Highly reduced |
Optic canal | Singular, centrally located |
Posterior clinoid process | Highly reduced |
Dorsum sellae | Diminutive |
Greater wing of sphenoid bone | |
Foramen rotundum | Size reduced |
Foramen ovale | Size reduced |
Temporal bone | |
Squamous part | Underdeveloped, anteriorly located |
Superior border of petrous part | Malformed, highly enlarged |
Trigeminal ganglion | Highly reduced |
Internal carotid artery | Not observed in gross view |
Internal acoustic meatus | Enlarged, bony protuberance |
All structures were present in the control fetus at 29 weeks.