Uveal Tract Flashcards
areas of firm attachments between choroid and sclera?
scleral spur, exit points of vortex veins, and at optic nerve
name the layers of the iris from anterior to posterior
anterior stromal layer (really just part of the stroma), srtoma, muscular layer, anterior pigmented epithelium, posterior pigmented epithelium
from where is the iris dilator muscle derived?
anterior layer of pigmented epithelium
What is iris color determined by?
number and size of melanin pigment granules in the anterior stromal melanocyes
3 layers of the choroid from anterior to posterior
choriocapillaris, stroma, lamina fusca
gene involved in sporadic anirida and Wilms tumor?
PAX6
collections of epithelioid histiocytes and lymphoctyes between RPE and Bruch?
Dalen-Fuchs nodules (seen in sympathetic ophthalmia and VKH)
diffuse, bilateral, granulomatous inflammation of the uveal tract consisting of epitheliod histiocytes and lymphocytes in patient with prior vitectomy
sympathetic ophthalmia
is sympathetic ophthalmia mostly humoral or cell mediated?
cell mediated
histologic distinction between sympathetic ophthalmia and VKH?
sympathetic ophthalmia generally spares the choriocapillaris
periphlebitis with candle wax dripping appearance in patient with noncaseating granulomatous uveal inflammation
sarcoidosis
histology of juvenile xanthogranuloma
skin or uvea involved. collections of lipid-laden histiocytes, Touton giant cells, lymphocytes, and occasional eosinophils. lesions are often vascularized
where do the majority of iris melanomas occur?
inferior sectors of iris
jet-black peripapillary uveal lesion?
melanocytoma
what barrier has been breached in a mushroom shape uveal melanoma?
Bruch membrane
tumor that involves the entire circumference of the ciliary body
ring melanoma
pigmented choroidal lesion and pigment clumps in angle in patient with high IOP in that eye?
melanomalytic glaucoma
2 most important variables associated with survival in uveal melanoma
size of largest tumor dimension in direct contact with sclera, and cell type making up the tumor
What is the modified Callender classification? What are the relative prognosis of the different classifications?
classifies cell type of uveal melanomas: spindle (best prognosis), epithelioid (worst), or mixed (intermediate)
what chromosomal abnormalities of a uveal melanoma are associated with increased mortality?
monosomy 3 and trisomy 8
Which of the following is NOT associated with increased mortality in uveal melanoma?
increased lymphocytes
extrasceral extension
invasion through Bruch membrane
juxtapapillary tumor location
invasion through Bruch membrane
mode of metastasis of uveal melanomas?
hematogenous to liver. lymphatic spread is very rare
most common intraocular tumor in adults?
metastatic lesion
most common primary intraocular malignancy in adults?
uveal melanoma
most common uveal met in women? men?
breast. lung.
well-defined, yellow-orange peripapillary tumor in young adult female, composed of compact bone?
choroidal osteoma
fundus appearance of traumatic choroidal rupture?
semicircular lines circumscribing the optic nerve head in the peripapillary region
