GF [PATHO] EYE

Question 1

Which optic nerve tumors can cause progressive proptosis due to mass effect within the orbit?

Answer 1

Glioma and meningioma 🟡(Optic nerve gliomas are often associated with NF1 and occur in children, while optic nerve sheath meningiomas are more common in adults. Both can cause unilateral proptosis and visual impairment due to compression of the optic nerve.)

Question 2

What is the most common primary tumor of the orbit in adults, typically presenting as a painless, slowly progressive mass?

Answer 2

Vascular tumors 🟡(Cavernous hemangioma is the most common benign orbital tumor in adults. It presents with painless proptosis due to its vascular nature. Memory anchor: adult orbit mass = cavernous hemangioma.)

Question 3

A chronic, painless granulomatous inflammation of the eyelid caused by obstruction of a Meibomian (sebaceous) gland is called what?

Answer 3

Chalazion 🟡(Chalazion results from blockage of sebaceous gland drainage leading to lipogranulomatous inflammation. It is painless, unlike a hordeolum (stye), which is painful and infectious.)

Question 4

What is the most common malignant tumor of the eyelid, classically presenting as a pearly papule with telangiectasia and possible ulceration?

Answer 4

Basal cell carcinoma 🟡(Basal cell carcinoma is the most common eyelid malignancy, especially on the lower lid. It is locally invasive but rarely metastasizes. Board clue: pearly lesion on sun-exposed eyelid.)

Question 5

What are the common submucosal conjunctival elevations seen in sun-exposed areas, with one potentially extending onto the cornea?

Answer 5

Pinguecula and pterygium 🟡(Pinguecula is a yellowish conjunctival deposit that does not invade the cornea, whereas pterygium is a triangular fibrovascular growth that can extend onto the cornea. Both are associated with UV exposure.)

Question 6

What is the most common site for conjunctival tumors to arise?

Answer 6

Limbus 🟡(The limbus, the junction between cornea and sclera, is a frequent site for conjunctival neoplasms due to high UV exposure. Board clue: conjunctival tumor near corneal edge.)

Question 7

Blue sclerae are classically associated with which genetic connective tissue disorder?

Answer 7

Osteogenesis imperfecta 🟡(In osteogenesis imperfecta, defective type I collagen causes thinning of the sclera, allowing visualization of underlying choroidal veins, producing a blue appearance. Associated with brittle bones and hearing loss.)

Question 8

A cone-shaped cornea associated with Down syndrome, Marfan syndrome, and atopy is called what?

Answer 8

Keratoconus 🟡(Keratoconus involves progressive thinning and protrusion of the cornea, leading to irregular astigmatism and visual distortion. Often associated with connective tissue disorders and chronic eye rubbing.)

Question 9

Chronic use of which class of drugs is associated with posterior subcapsular cataract formation?

Answer 9

Corticosteroids 🟡(Long-term corticosteroid use can cause posterior subcapsular cataracts. Other causes include diabetes and radiation. Board distinction: steroid use = posterior cataract.)

Question 10

Which metabolic diseases are commonly associated with cataract formation?

Answer 10

Galactosemia, diabetes mellitus, and Wilson disease 🟡(Galactosemia causes accumulation of galactitol in the lens; diabetes leads to sorbitol accumulation; Wilson disease can produce sunflower cataracts due to copper deposition.)

Question 11

In which type of glaucoma does the iris adhere to and obstruct the trabecular meshwork, blocking aqueous humor outflow and causing acute elevation of intraocular pressure?

Answer 11

Angle-closure glaucoma 🟡(Angle-closure glaucoma occurs when the peripheral iris obstructs the anterior chamber angle, preventing aqueous drainage. It presents acutely with severe eye pain, headache, halos around lights, and a mid-dilated fixed pupil. Memory anchor: closed angle = sudden painful vision loss.)

Question 12

What is the most common form of glaucoma characterized by progressive optic neuropathy with an open anterior chamber angle and gradual peripheral vision loss?

Answer 12

Primary open-angle glaucoma 🟡(Primary open-angle glaucoma is the most common type of glaucoma. It involves decreased aqueous humor outflow through the trabecular meshwork despite an open angle. It presents insidiously with increased intraocular pressure and progressive cupping of the optic disc.)

Question 13

Inflammation confined within the vitreous humor, usually due to infection after surgery, trauma, or hematogenous spread, is termed what?

Answer 13

Endophthalmitis 🟡(Endophthalmitis is a severe intraocular infection involving the vitreous and aqueous humor. It is vision-threatening and often occurs postoperatively or from systemic bacteremia. Key distinction: confined inside the globe.)

Question 14

Diffuse inflammation involving all layers of the eye including retina, choroid, and sclera is called what?

Answer 14

Panophthalmitis 🟡(Panophthalmitis refers to inflammation of all ocular coats and intraocular structures. It is more extensive than endophthalmitis and may lead to orbital involvement.)

Question 15

Which autoimmune disorders are classically associated with uveitis?

Answer 15

Reactive arthritis, Behçet syndrome, and juvenile idiopathic arthritis 🟡(Uveitis is commonly linked to HLA-B27–associated disorders such as reactive arthritis and ankylosing spondylitis, as well as Behçet syndrome and JIA. Board clue: recurrent eye inflammation + systemic inflammatory disease.)

Question 16

What is the most common intraocular malignancy in adults overall?

Answer 16

Choroidal metastasis 🟡(Metastases to the choroid, most commonly from breast and lung cancer, are the most frequent intraocular malignancies in adults. Distinguish from most common primary intraocular tumor.)

Question 17

What is the most common primary intraocular malignancy in adults?

Answer 17

Uveal melanoma 🟡(Uveal melanoma arises from melanocytes of the choroid and is the most common primary intraocular malignancy in adults. It may present with visual disturbances or be found incidentally.)

Question 18

Which type of retinal detachment is caused by a full-thickness retinal tear allowing vitreous fluid to accumulate beneath the retina?

Answer 18

Rhegmatogenous 🟡(Rhegmatogenous retinal detachment results from a retinal break. Risk factors include posterior vitreous detachment, trauma, and high myopia. “Rhegma” means break.)

Question 19

What are the focal choroidal infarcts seen in hypertensive retinopathy due to fibrinoid necrosis of choroidal vessels?

Answer 19

Elschnig spots 🟡(Elschnig spots represent choroidal ischemia in severe hypertension. They appear as small yellow-black lesions and indicate vascular damage.)

Question 20

Copper or silver wiring appearance of retinal arteries in chronic hypertension is due to what underlying pathology?

Answer 20

Retinal arteriosclerosis 🟡(Chronic hypertension causes thickening and sclerosis of retinal arterioles, producing copper or silver wiring on fundoscopic exam. It reflects vascular wall thickening.)

Question 21

What is the most common retinal vascular disease and a leading cause of blindness in working-age adults?

Answer 21

Diabetic retinopathy 🟡(Diabetic retinopathy results from chronic hyperglycemia causing microvascular damage, capillary leakage, and ischemia. It progresses from nonproliferative to proliferative stages.)

Question 22

What is the earliest ophthalmoscopic finding in nonproliferative diabetic retinopathy?

Answer 22

Microaneurysms 🟡(Microaneurysms are the earliest clinically visible sign of diabetic retinopathy. They result from pericyte loss and capillary wall weakness, appearing as small red dots on fundus exam.)

Question 23

In which retinal vascular diseases is pathologic neovascularization commonly observed due to ischemia-driven VEGF release?

Answer 23

Proliferative diabetic retinopathy, ischemic retinal vein occlusion, retinopathy of prematurity, and wet age-related macular degeneration 🟡(Retinal ischemia stimulates VEGF production leading to neovascularization. This occurs in proliferative diabetic retinopathy and ischemic CRVO; in ROP due to oxygen fluctuations in premature infants; and in wet AMD due to choroidal neovascularization through Bruch membrane.)

Question 24

A patient presents with sudden painless unilateral vision loss; fundus shows diffuse retinal pallor with a cherry-red spot at the macula. What is the most likely diagnosis?

Answer 24

Central retinal artery occlusion 🟡(CRAO causes acute retinal ischemia. The pale retina contrasts with the intact choroidal circulation at the fovea, producing a cherry-red spot. It is often embolic from carotid atherosclerosis or cardiac source. Ophthalmologic emergency.)

Question 25

Which type of age-related macular degeneration is characterized by drusen deposits beneath the retinal pigment epithelium along Bruch membrane?

Answer 25

Dry (atrophic) age-related macular degeneration 🟡(Dry AMD is marked by drusen—yellow extracellular deposits—leading to gradual central vision loss. It is more common than wet AMD and lacks neovascularization.)

Question 26

What is the most common primary intraocular malignancy in infants and young children, often presenting with leukocoria?

Answer 26

Retinoblastoma 🟡(Retinoblastoma arises from retinal precursor cells due to RB gene mutation. Classic presentation is leukocoria and possible strabismus. Can be hereditary or sporadic.)

Question 27

What characteristic histologic finding in retinoblastoma shows tumor cells arranged in a spoke-and-wheel pattern around a central lumen?

Answer 27

Flexner-Wintersteiner rosettes 🟡(These true rosettes indicate photoreceptor differentiation. They are characteristic of retinoblastoma. Board clue: pediatric eye tumor + rosettes.)

Question 28

An atrophic, shrunken, internally disorganized eye often referred to as an end-stage eye is called what?

Answer 28

Phthisis bulbi 🟡(Phthisis bulbi represents severe ocular damage from trauma, inflammation, or advanced disease, resulting in a small, nonfunctional globe.)

Question 29

On which chromosome is the RB tumor suppressor gene located?

Answer 29

Chromosome 13 🟡(The RB1 gene is located on chromosome 13q14. Loss of both alleles leads to retinoblastoma. Remember: “13 = unlucky for retina.”)

Question 30

Bilateral optic disc edema (papilledema) is most commonly a sign of what underlying condition?

Answer 30

Increased intracranial pressure 🟡(Papilledema results from elevated intracranial pressure transmitted via the optic nerve sheath, leading to bilateral disc swelling. It is a neurologic emergency indicator, not primarily an ocular disease.)