A number of conditions can result the optic canal having a decreased diameter.
Conditions associated with a narrow optic canal:
(1) developmental abnormality (see below)
(2) dysostosis (see below)
(3) osteitis of bone along the canal
(4) meningioma or other tumor
Developmental abnormalities include:
(1) anophthalmos or microphthalmos
(2) enucleation
(3) craniosynostosis
Dysostoses include:
(1) osteopetrosis
(2) fibrous dysplasia (Albright's disease)
(3) craniometaphyseal dysplasia (Pyle disease)
(4) Paget's disease of bone (osteitis deformans)
