Diseases of the Retina Practice Questions

Q: A 2-year-old girl presents with deteriorating vision, a whitish hue in the right pupil, strabismus, and ocular pain and tenderness. An ophthalmologist removes a multifocal tumor from the right eye. Pathology reveals rosettes composed of cuboidal-to-columnar cells surrounding a central lumen. What gene mutation on which chromosome is most likely responsible for this condition?

Chromosome 13. ### Explanation The clinical presentation of a 2-year-old with **leukocoria** (whitish pupillary reflex), strabismus, and a multifocal intraocular tumor is classic for **Retinoblastoma**, the most common primary intraocular malignancy of childhood. **1. Why Chromosome 13 is Correct:** Retinoblastoma is caused by a mutation in the **RB1 gene**, located on **Chromosome 13 (specifically 13q14)**. This gene is a tumor suppressor that regulates the cell cycle (G1 to S phase transition). According to **Knudson’s "two-hit" hypothesis**, both alleles of the RB1 gene must be inactivated for the tumor to develop. The pathology description of "rosettes surrounding a central lumen" refers to **Flexner-Wintersteiner rosettes**, which are pathognomonic for retinoblastoma and represent photoreceptor differentiation. **2. Why Other Options are Incorrect:** * **Chromosome 5:** Associated with Familial Adenomatous Polyposis (APC gene). * **Chromosome 7:** Associated with Cystic Fibrosis (CFTR gene) and Williams syndrome. * **Chromosome 9:** Associated with Tuberous Sclerosis (TSC1 gene) and Friedreich’s ataxia. **3. Clinical Pearls for NEET-PG:** * **Most common sign:** Leukocoria (60%), followed by Strabismus (20%). * **Pathology:** * **Flexner-Wintersteiner rosettes:** Specific for Retinoblastoma (lumen contains hyaluronic acid). * **Homer Wright rosettes:** Non-specific (also seen in neuroblastoma/medulloblastoma); no central lumen. * **Calcification:** Dystrophic calcification is a hallmark feature seen on CT scans (helps differentiate from Coats' disease). * **Trilateral Retinoblastoma:** Bilateral retinoblastoma associated with a pineal gland tumor (Pineoblastoma). * **Inheritance:** 40% are heritable (germline mutation, often bilateral/multifocal); 60% are sporadic (somatic mutation, usually unilateral). [1]

Q: A patient presented with ocular complaints and was found to have 'Dalen-Fuchs nodules'. These nodules are characteristic of which of the following conditions?

Sympathetic ophthalmia. **Explanation:** **Sympathetic Ophthalmia (SO)** is a rare, bilateral granulomatous panuveitis that occurs following a penetrating ocular injury or intraocular surgery to one eye (the "exciting eye"). The fellow, uninjured eye (the "sympathizing eye") subsequently develops inflammation due to a cell-mediated autoimmune response against uveal antigens. **Dalen-Fuchs nodules** are the hallmark histopathological and clinical feature of SO. They are small, yellowish-white, elevated lesions located between the **Bruch’s membrane and the Retinal Pigment Epithelium (RPE)**. They consist of aggregates of epithelioid cells, lymphocytes, and pigment-laden macrophages. **Analysis of Incorrect Options:** * **A. Eales disease:** An idiopathic peripheral inflammatory venulitis characterized by peripheral retinal ischemia, neovascularization, and recurrent vitreous hemorrhage. It does not feature Dalen-Fuchs nodules. * **B. Allergic conjunctivitis:** A Type I hypersensitivity reaction involving the conjunctiva. Clinical signs include chemosis, itching, and papillae (e.g., Cobblestone papillae in VKC), but no intraocular granulomatous nodules. * **D. Retinal detachment:** A structural separation of the neurosensory retina from the RPE. While it can occur secondary to severe uveitis (exudative RD), it is not the primary association for Dalen-Fuchs nodules. **High-Yield Clinical Pearls for NEET-PG:** * **Vogt-Koyanagi-Harada (VKH) Syndrome:** Dalen-Fuchs nodules are also seen here, as it shares a similar granulomatous pathology with SO. * **Prevention:** Evisceration/Enucleation of a severely injured eye within **2 weeks** (the "safe period") can prevent the development of SO in the sympathizing eye. * **Histology:** SO is characterized by a "non-necrotizing granulomatous inflammation" with **sparing of the choriocapillaris**.

Q: Choroidal vascularization is seen in which of the following refractive errors?

Myopia. **Explanation:** **Choroidal Neovascularization (CNV)** is a hallmark complication of **Pathological Myopia** (typically defined as refractive error > -6.00D or axial length > 26.5 mm). 1. **Why Myopia is correct:** In high myopia, the progressive elongation of the eyeball leads to mechanical stretching and thinning of the retina, choroid, and sclera. This stress causes linear breaks in the **Bruch’s membrane**, known as **Lacquer cracks**. These cracks act as conduits, allowing new, fragile blood vessels from the choroid to grow into the subretinal space (CNV). A classic clinical sign associated with this is the **Fuchs’ Spot**—a pigmented lesion at the macula representing a scarred CNV. 2. **Why other options are incorrect:** * **Hypermetropia:** The eyeball is shorter than normal. While it is associated with conditions like angle-closure glaucoma, it does not involve the mechanical stretching of the posterior pole required for CNV. * **Presbyopia:** This is an age-related physiological loss of accommodation due to decreased elasticity of the crystalline lens; it does not involve structural changes to the retina or choroid. * **Astigmatism:** This is a refractive error caused by an irregular curvature of the cornea or lens and does not predispose the patient to choroidal vascular pathology. **High-Yield Clinical Pearls for NEET-PG:** * **Fuchs’ Spot:** A pigmented, circular lesion at the macula following a subretinal hemorrhage in high myopia. * **Lacquer Cracks:** Mechanical breaks in Bruch’s membrane; they are the strongest precursor to myopic CNV. * **Treatment of choice:** Intravitreal **Anti-VEGF** (e.g., Ranibizumab, Bevacizumab) is the gold standard for managing myopic CNV. * **Other associations of High Myopia:** Posterior staphyloma, Rhegmatogenous Retinal Detachment (RRD), and Lattice degeneration.

Q: All of the following are differential diagnoses for cotton wool spots in the fundus except?

Eales' disease. **Explanation:** **Cotton Wool Spots (CWS)**, also known as soft exudates, represent localized areas of retinal ischemia. They occur due to the obstruction of precapillary arterioles, leading to the failure of axoplasmic transport within the nerve fiber layer (NFL) and subsequent accumulation of "cytoid bodies." **Why Eales' Disease is the correct answer:** Eales' disease is an idiopathic peripheral inflammatory veno-occlusive disease (perivasculitis). Its hallmark features are peripheral retinal neovascularization, recurrent vitreous hemorrhage, and tractional retinal detachment. While it involves ischemia, it primarily affects the peripheral venous system rather than the precapillary arterioles of the posterior pole where CWS are typically observed. Therefore, CWS are not a characteristic feature of Eales' disease. **Analysis of incorrect options:** * **AIDS:** CWS are the most common clinical finding in HIV retinopathy, caused by microvascular injury or direct viral infection of the endothelium. * **Diabetic Retinopathy:** CWS are a classic feature of Pre-proliferative Diabetic Retinopathy (PPDR), signifying significant retinal ischemia. * **Hypertension:** CWS are a hallmark of Grade III Modified Scheie/Keith-Wagener-Barker classification of hypertensive retinopathy. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for CWS (PANIC):** **P**apilledema, **A**IDS, **N**ormal tension glaucoma, **I**schemia (Diabetes/HTN), **C**ollagen vascular diseases (SLE). * **Cytoid Bodies:** These are the histological equivalent of cotton wool spots. * **Purtscher’s Retinopathy:** Characterized by multiple CWS and hemorrhages following severe head or chest trauma. * **Eales' Disease:** Most commonly affects young adult males; strongly associated with hypersensitivity to tuberculoprotein (Mantoux positive).

Q: Fluorescein angiography of a patient shows 'Bull's eye' lesions on the retina. Bull's eye retinopathy is due to what?

Phenothiazines. **Explanation:** **Bull’s eye maculopathy** is a classic clinical finding characterized by a central ring of retinal pigment epithelium (RPE) atrophy surrounding a spared central foveal area, giving it a target-like appearance on fundoscopy and fluorescein angiography (FA). **Why Phenothiazines are correct:** Phenothiazines, particularly **Thioridazine** and **Chlorpromazine**, are antipsychotic medications known to cause pigmentary retinopathy. Thioridazine, in high doses (typically >800mg/day), binds to the melanin in the RPE, leading to toxic accumulation and subsequent atrophy of the RPE and photoreceptors, resulting in the characteristic Bull’s eye appearance. **Why other options are incorrect:** * **Infrared light:** Exposure to infrared light is associated with "Glassblower’s cataract" (thermal injury to the lens), not specific macular pigmentary changes. * **UV-light:** Chronic UV exposure is linked to photokeratitis, pterygium, and potentially age-related macular degeneration (AMD), but it does not produce a Bull’s eye lesion. * **NSAIDs:** While some NSAIDs (like Indomethacin) can rarely cause corneal deposits or retinal pigment changes, they are not the classic or primary cause of Bull’s eye retinopathy. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Cause:** The most frequently tested cause of Bull's eye maculopathy is **Chloroquine** and **Hydroxychloroquine** (used in SLE/RA). * **Differential Diagnosis (Mnemonic: "CHLORPS"):** * **C:** Chloroquine/Hydroxychloroquine * **H:** Hereditary (Stargardt disease, Cone dystrophy) * **L:** Lipofuscinosis * **O:** Other (Fenretinide) * **R:** Rod-Cone dystrophy * **P:** Phenothiazines * **S:** Spielmeyer-Vogt disease * **FA Finding:** On Fluorescein Angiography, the lesion shows a **"Window Defect"** due to RPE atrophy allowing underlying choroidal fluorescence to show through.

Q: Which of the following are risk factors for the development of diabetic retinopathy?

All of the above. Diabetic Retinopathy (DR) is a microangiopathic complication of diabetes mellitus. The development and progression of DR are influenced by several systemic and genetic factors. **Explanation of the Correct Answer:** * **Duration of Diabetes (Option A):** This is the **most important** risk factor. The longer a patient has diabetes, the higher the risk of developing retinopathy. Approximately 75-90% of patients with Type 1 and 60% of patients with Type 2 diabetes will show signs of DR after 20 years. * **Heredity (Option B):** Genetic predisposition plays a significant role. Specific genetic markers and family history can influence the severity and speed of retinal damage, explaining why some patients develop proliferative disease despite good glycemic control. * **Pregnancy (Option C):** Pregnancy is a known risk factor for the rapid progression of pre-existing DR. This is attributed to hormonal changes, increased retinal blood flow, and relative ischemia. Diabetic women planning pregnancy should have a baseline eye exam and frequent monitoring. Since all three factors contribute significantly to the pathogenesis, **Option D (All of the above)** is the correct choice. **High-Yield Clinical Pearls for NEET-PG:** * **Modifiable Risk Factors:** Poor glycemic control (HbA1c levels), Hypertension, Anemia, and Nephropathy (the "Renal-Retinal" relationship). * **Protective Factors:** High myopia and Carotid artery stenosis (due to reduced perfusion pressure protecting the retinal microvasculature). * **Screening:** Type 1 diabetics should be screened 5 years after diagnosis; Type 2 diabetics should be screened **at the time of diagnosis**. * **First Clinical Sign:** Microaneurysms (located in the inner nuclear layer).

Q: Exudative retinopathy in hypertension is due to which of the following?

Renal artery stenosis. **Explanation:** The correct answer is **Renal artery stenosis**. **Underlying Medical Concept:** Exudative retinopathy (specifically **Hypertensive Retinopathy Grade IV**) is characterized by severe vascular leakage, macular edema, and the presence of a "Macular Star" (hard exudates). In the context of hypertension, this typically occurs during **Malignant or Accelerated Hypertension**. Renal artery stenosis is a classic cause of **Secondary Hypertension** mediated by the Renin-Angiotensin-Aldosterone System (RAAS). The resulting severe, refractory high blood pressure leads to a breakdown of the blood-retinal barrier, causing the leakage of plasma constituents and lipids into the retina, manifesting as exudative retinopathy. **Analysis of Incorrect Options:** * **Coarctation of the aorta:** While it causes upper limb hypertension, it rarely leads to the acute, malignant levels of diastolic pressure required to produce florid exudative retinopathy. * **Type I Takayasu's arteritis:** This primarily involves the arches of the aorta and its branches. It often leads to "pulseless disease" and **hypotensive retinopathy** (Takayasu’s Retinopathy) due to ocular ischemia, rather than hypertensive exudative changes. * **Diabetic atherosclerosis:** This contributes to chronic macrovascular disease but is not a direct mechanism for the acute exudative changes seen in hypertensive retinopathy. **High-Yield Clinical Pearls for NEET-PG:** * **Keith-Wagener-Barker Classification:** Grade IV is defined by the presence of **Papilledema**. * **Macular Star:** Formed by hard exudates (lipids) deposited in the **Henle’s layer** of the retina. * **Elschnig Spots:** Small black spots surrounded by yellow halos, representing focal choroidal infarcts (a sign of hypertensive choroidopathy). * **Siegrist Streaks:** Linear hyperpigmented streaks along choroidal vessels, also seen in malignant hypertension.

Q: Purtscher's retinopathy results from:

Chest injuries. **Purtscher’s Retinopathy** is a traumatic angiopathy typically associated with severe **compressive chest injuries** or long-bone fractures. ### 1. Why "Chest Injuries" is Correct The underlying pathophysiology involves sudden, severe compression of the chest or abdomen, which leads to a rapid increase in intrathoracic pressure. This pressure is transmitted to the retinal vasculature, causing **complement activation (C5a)** and the formation of **leukocyte aggregates**. These aggregates embolize and occlude retinal precapillary arterioles, leading to characteristic findings: * **Purtscher flecks:** Areas of inner retinal whitening/ischemia between the retinal arterioles and venules. * **Cotton wool spots and superficial hemorrhages:** Located primarily around the optic disc. ### 2. Why Other Options are Incorrect * **Head Injuries:** While head trauma can cause ocular damage (like Terson syndrome or optic nerve avulsion), Purtscher’s retinopathy is specifically linked to distant compressive trauma or systemic conditions (like acute pancreatitis), not direct cranial impact. * **Trichiasis:** This is a mechanical condition where eyelashes are misdirected toward the globe, causing corneal irritation and scarring. It has no vascular or embolic component. ### 3. Clinical Pearls for NEET-PG * **Classic Association:** Severe chest compression (crush injury) and **Acute Pancreatitis** (Purtscher-like retinopathy). * **Diagnostic Sign:** The presence of "Purtscher flecks" (pathognomonic) which represent capillary non-perfusion. * **Differential:** **Terson Syndrome** (vitreous/retinal hemorrhage associated with subarachnoid hemorrhage). * **Management:** Usually observation; the retinopathy often resolves spontaneously as the systemic condition stabilizes, though permanent vision loss can occur.

Question 1

A 2-year-old girl presents with deteriorating vision, a whitish hue in the right pupil, strabismus, and ocular pain and tenderness. An ophthalmologist removes a multifocal tumor from the right eye. Pathology reveals rosettes composed of cuboidal-to-columnar cells surrounding a central lumen. What gene mutation on which chromosome is most likely responsible for this condition?

Accepted Answer

Chromosome 13

Answer

Chromosome 5

Answer

Chromosome 7

Answer

Chromosome 9

Question 2

Retinal detachment is not seen in which of the following conditions?

Accepted Answer

Hypermetropia

Answer

High myopia

Answer

Aphakia

Answer

Choroiditis

Question 3

A patient presented with ocular complaints and was found to have 'Dalen-Fuchs nodules'. These nodules are characteristic of which of the following conditions?

Accepted Answer

Sympathetic ophthalmia

Answer

Eales disease

Answer

Allergic conjunctivitis

Answer

Retinal detachment

Question 4

Choroidal vascularization is seen in which of the following refractive errors?

Accepted Answer

Myopia

Answer

Hypermetropia

Answer

Presbyopia

Answer

Astigmatism

Question 5

All of the following are differential diagnoses for cotton wool spots in the fundus except?

Accepted Answer

Eales' disease

Answer

AIDS

Answer

Diabetic retinopathy

Answer

Hypertension

Question 6

Fluorescein angiography of a patient shows 'Bull's eye' lesions on the retina. Bull's eye retinopathy is due to what?

Accepted Answer

Phenothiazines

Answer

Infrared light

Answer

UV-light

Answer

NSAIDS

Question 7

What clinical finding differentiates ophthalmic artery occlusion from central retinal artery occlusion?

Accepted Answer

Absence of cherry-red spot

Answer

Sudden painless loss of vision

Answer

Box-carring of vessels

Answer

Area of retinal whitening

Question 8

Which of the following are risk factors for the development of diabetic retinopathy?

Accepted Answer

All of the above

Answer

Duration of diabetes

Answer

Heredity

Answer

Pregnancy

Question 9

Exudative retinopathy in hypertension is due to which of the following?

Accepted Answer

Renal artery stenosis

Answer

Coarctation of the aorta

Answer

Type I Takayasu's arteritis

Answer

Diabetic atherosclerosis

Question 10

Purtscher's retinopathy results from:

Accepted Answer

Chest injuries

Answer

Head injuries

Answer

Trichiasis

Answer

All of the above

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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