New PDF release: 2011-2012 Basic and Clinical Science Course, Section 7:

By John Bryan Holds MD

ISBN-10: 1615251146

ISBN-13: 9781615251148

Information the anatomy of the orbit and adnexa, and emphasizes a pragmatic method of the assessment and administration of orbital and eyelid issues, together with malpositions and involutional alterations. Updates present info on congenital, inflammatory, infectious, neoplastic and hectic stipulations of the orbit and accent constructions. Covers key points of orbital, eyelid and facial surgical procedure. contains a variety of new colour photos. significant revision 2011-2012.

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Additional info for 2011-2012 Basic and Clinical Science Course, Section 7: Orbit, Eyelids, and Lacrimal System (Basic & Clinical Science Course)

Example text

Compared with CT, MRI also provides better tissue contrast of structures in the orbital apex, intracanalicular portion of the optic nerve, structures in periorbital spaces, and orbitocranial tum ors, as there is no artifact from the skull base bones. Bone and calcification produce low Signal on MRI. Bony stru ctures may be evaluated by visualization of the Signal void left by the bone. However, this is not possible when the bone is adjacent to stru ctures that also create a Signal void, such as air, rapidly flo wing blood, calcification, and dura mater.

However, in some cases of early enucleation, dermis-fat grafts have been used successfully as 0 [ - bital implants. These grafts appear to grow along with the patient, resulting in progressive socket expansion. For older microphthalm ic children, cran iofacial techniques have been used to reposition and resize the orbit. Such repairs are comp lex, as noted in the following discussion of craniofacial clefting. Microphthalmia with orbital cyst results from the fa ilu re of the choroidal fissure to close in the embryo.

Cour- Figure tesy of James Garrity. ) CHAPTER 3: Congen ital Orbita l Anoma lies . 35 Figure 3·2 Crouzon syndrome (craniofacial dysostosis). (Courtes y of Jill Foster. ) (meningocele), brain tissue (encephalocele), or both meninges and brain tissue (men ingoencephalocele). When these herni ations involve the orbit, they most common ly present anteri orly wi th a protrusion subcutaneo usly near the med ial canthus or over the bridge of the nose. Straining or crying may increase the size of the Illass, and the globe may be displaced temporally and dow nward (in ferolate rall y).

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2011-2012 Basic and Clinical Science Course, Section 7: Orbit, Eyelids, and Lacrimal System (Basic & Clinical Science Course) by John Bryan Holds MD


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