By John Bryan Holds MD
Info the anatomy of the orbit and adnexa, and emphasizes a pragmatic method of the assessment and administration of orbital and eyelid problems, together with malpositions and involutional adjustments. Updates present info on congenital, inflammatory, infectious, neoplastic and irritating stipulations of the orbit and accent constructions. Covers key features of orbital, eyelid and facial surgical procedure. comprises various 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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Additional info for 2011-2012 Basic and Clinical Science Course, Section 7: Orbit, Eyelids, and Lacrimal System (Basic & Clinical Science Course)
Classic examples are dermoid cysts, epidermoid cysts, dermolipomas and teratomas. These congenital and juvenile tu mors are discussed further in BCSC Section 6, Pediatric OphthallllOlogy and Strabismus. l Dermoid cyst Dermoid and epidermoid cysts are among the most common orbital tumors of childhood. These cysts are present congenitally and enlarge progreSSively. The more superficial cysts usually become symptomat ic in childhood, but deeper orbital dermoids may no t become clinically evident until adu lthood.
This sinus is divided into 2 cavit ies by a bony septum. Occasionally, pneumatization extends into the pterygoid and occipital bones. The sinus drains into the sphenoethmoidal recess of each nasal fossa. The optic canal is located immed iately superolateral to the sinus wall. Visual loss and visual fi eld abnormalit ies can be direct sequelae of pathologic processes involving the sphenoid sinus. The maxillary sinuses are the largest of the paranasal sinuses. Together, the roofs of each max illary sinus form the floor of the orbits.
An d pupi llary abnormalities suggest 42 • Orbit, Eyel ids, and Lacrima l System Table 4-2 Causes of Orbital Cellulitis Extension from p eriorbital structures Paranasal sinuses Fa ce and eye lid s Lacrima l sac (dacryocystitis) Teeth (denta l infect ion) Exogenous causes Trauma (rul e out forei gn bodies) Surgery (after any orbital or periorbital surg ery ) Endogenous causes Bacteremia w ith sept ic embol izat ion Intraorbital causes End op hth almi ti s Dacryoa den itis comp ressive opt ic ne uropat hy dem a ndi ng im mediate investi ga tion and aggress ive man ageme nt.