Orbit / Lids / Adnexa

6 Orbit / Lids / Adnexa




Anatomy





Apertures


(Figures 6-1 to 6-3)
















Vascular Supply to Eye


(Figures 6-4 to 6-6)










Soft Tissues


(Figure 6-9)








Eyelid








Upper eyelid retractors


(Figure 6-13)


















Imaging





MRI


Strong magnetic field results in alignment of nuclei of atoms with odd numbers of protons or neutrons


Radiofrequency pulse disturbs the alignment by energizing protons or neutrons


When pulse terminates, protons return to previous alignment and emit absorbed energy as radiofrequency signal, generating an image


Can provide axial, coronal, and sagittal views









Orbital Disorders




Trauma




Orbital Fractures


Fractures of orbital bones, often associated with ocular or intracranial injuries













Infections







Inflammation



Idiopathic Orbital Inflammation (Orbital Pseudotumor)


Idiopathic inflammatory disease of orbital tissues












Jun 4, 2016 | Posted by in OPHTHALMOLOGY | Comments Off on Orbit / Lids / Adnexa
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