By John Bryan Holds MD
Information the anatomy of the orbit and adnexa, and emphasizes a pragmatic method of the overview and administration of orbital and eyelid issues, together with malpositions and involutional alterations. Updates present info on congenital, inflammatory, infectious, neoplastic and disturbing stipulations of the orbit and accent buildings. Covers key points of orbital, eyelid and facial surgical procedure. comprises quite a few new colour pictures. significant revision 2011-2012.
Read Online or Download 2011-2012 Basic and Clinical Science Course, Section 7: Orbit, Eyelids, and Lacrimal System (Basic & Clinical Science Course) PDF
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Extra resources for 2011-2012 Basic and Clinical Science Course, Section 7: Orbit, Eyelids, and Lacrimal System (Basic & Clinical Science Course)
These fungi, belonging to the class Zygomyce tes, almost always extend into the orbit from an adjacent sinus or the nasal cavity.
Defects in the bony orbital walls may result from si nus mucoceles, surgical removal of bone, trauma, or developmental abnormalities, including encephalocele. meningocele, or sphenoid wing dysplasia (associated with neurofibromatosis). Auscultation Auscultation with a stethoscope over the globe or on the mastoid bone may detect bruits in cases of carotid cavernous fistula. The patient may also subjectively describe an audible bruit. Patients with such arteriovenous communications often have tortuous dilated epibulbar vessels (see Chapter 4, Fig 4-5B).
Thus, CT is superior to M Rl for the evaluation offractures, bone destruction, and tissue calcification. MRI is contra in dicated in patients who have ferromagnetic metallic foreign bodies in the orbit or periorbital soft tissue, ferromagnetic vascular clips from previous surgery. magnetic intravascular filte rs, or electronic devices in the body such as cardiac pacemakers. If necessary. the presence of such foreign material can be ruled out with plain films or CT. Certain types of eye makeup can produce artifacts and should be removed prior to MRI.