Diseases of the Retina Practice Questions

Q: What is the most common type of retinal detachment seen in proliferative diabetic retinopathy?

Tractional. **Explanation:** The correct answer is **Tractional Retinal Detachment (TRD)**. **1. Why Tractional is Correct:** In Proliferative Diabetic Retinopathy (PDR), chronic ischemia triggers the release of Vascular Endothelial Growth Factor (VEGF), leading to **neovascularization**. These fragile new vessels grow along with a fibrous scaffold (fibrovascular proliferation) into the vitreous. Over time, this fibrous tissue contracts, creating mechanical "traction" that pulls the sensory retina away from the underlying Retinal Pigment Epithelium (RPE). Unlike other types, TRD occurs without a retinal break and typically presents with a concave, immobile surface. **2. Why Other Options are Incorrect:** * **Rhegmatogenous (A):** This is the most common type of RD overall, caused by a **retinal break/hole** allowing fluid to enter the subretinal space. While a "combined" tractional-rhegmatogenous RD can occur in late-stage PDR, pure TRD is the hallmark. * **Exudative (C):** Also known as serous RD, this occurs due to fluid leakage (e.g., inflammation or tumors) without traction or breaks. While PDR involves leakage (macular edema), it does not typically cause extensive exudative RD. * **Retinoschisis (D):** This is a splitting of the retinal layers (usually at the outer plexiform layer), not a true detachment of the retina from the RPE. **Clinical Pearls for NEET-PG:** * **Management:** The gold standard treatment for Tractional RD involving the macula is **Pars Plana Vitrectomy (PPV)** to relieve the traction. * **Configuration:** TRD is typically **concave** and limited in mobility, whereas Rhegmatogenous RD is **convex** and ripples with eye movement. * **High-Yield Fact:** The most common cause of vitreous hemorrhage in adults is PDR; if the fundus is obscured by blood, **B-Scan Ultrasonography** is mandatory to rule out an underlying TRD.

Q: Which of the following is NOT a treatment modality for wet age-related macular degeneration (ARMD)?

Panretinal photocoagulation. **Explanation:** The core pathology in **Wet (Neovascular) Age-Related Macular Degeneration (ARMD)** is the development of **Choroidal Neovascularization (CNV)**. These abnormal vessels leak fluid and blood under the macula, leading to rapid vision loss. **Why Panretinal Photocoagulation (PRP) is the correct answer:** PRP involves applying laser burns to the peripheral retina to reduce the overall oxygen demand, thereby regressing neovascularization. It is the gold standard treatment for **Proliferative Diabetic Retinopathy (PDR)** and **Ischemic Central Retinal Vein Occlusion (CRVO)**. It is **not** used for ARMD because the pathology in ARMD is localized to the macula, and applying PRP would not address the subfoveal CNV. **Analysis of other options:** * **Anti-VEGF therapy (e.g., Ranibizumab, Bevacizumab, Aflibercept):** This is the **first-line treatment** for wet ARMD. It inhibits Vascular Endothelial Growth Factor, reducing vascular permeability and clinical edema. * **Photodynamic Therapy (PDT):** Uses a photosensitizer (Verteporfin) and a cold laser to selectively destroy CNV membranes while sparing the overlying retina. It is used in specific cases like Polypoidal Choroidal Vasculopathy (PCV). * **Macular Grid Photocoagulation:** While largely replaced by Anti-VEGF, focal or grid laser was historically used for well-defined extrafoveal CNV in ARMD. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest symptom of ARMD:** Metamorphopsia (distortion of vision), tested using the **Amsler Grid**. * **Hallmark of Dry ARMD:** Drusen (sub-retinal yellow deposits) and geographic atrophy. * **Investigation of choice:** **Optical Coherence Tomography (OCT)** is used for monitoring; **Fundus Fluorescein Angiography (FFA)** is used to confirm and type the CNV. * **Dietary Supplement:** AREDS-2 formulation (Antioxidants, Zinc, Lutein, Zeaxanthin) is used to slow progression in *Dry* ARMD.

Q: The "salt and pepper fundus" is a characteristic clinical finding in which of the following conditions?

Congenital syphilis. **Explanation:** The **"Salt and Pepper Fundus"** refers to a characteristic pigmentary retinopathy consisting of diffuse, fine, mottled areas of retinal pigment epithelium (RPE) atrophy (the "salt") interspersed with clumps of pigment hypertrophy (the "pepper"). **1. Why Congenital Syphilis is Correct:** In **Congenital Syphilis**, this finding is a classic late manifestation. It results from a chronic, low-grade inflammatory process (chorioretinitis) caused by *Treponema pallidum*. Unlike Retinitis Pigmentosa, it is usually non-progressive, and the retinal vessels and optic disc typically remain normal. It is often asymptomatic but can be associated with interstitial keratitis and Hutchinson’s teeth (Hutchinson’s Triad). **2. Analysis of Incorrect Options:** * **Multiple Sclerosis:** Primarily associated with **Optic Neuritis** (sudden vision loss, RAPD) and Internuclear Ophthalmoplegia (INO), not pigmentary retinal changes. * **Cystinosis:** Characterized by the deposition of shimmering, needle-shaped **cystine crystals** in the cornea and conjunctiva, leading to photophobia. * **Weill-Marchesani Syndrome:** A connective tissue disorder characterized by **microspherophakia** (small, spherical lens), high myopia, and ectopia lentis, but not a salt and pepper fundus. **3. NEET-PG High-Yield Clinical Pearls:** * **Differential Diagnosis of Salt and Pepper Fundus:** 1. **Congenital Syphilis** (Most common association). 2. **Congenital Rubella** (Most common ocular finding in Rubella). 3. **Leber’s Congenital Amaurosis** (Early stage). 4. **Cystinosis** (Can occasionally show peripheral mottling, but crystals are the hallmark). 5. **Cockayne Syndrome.** * **Key Distinction:** In syphilis, the "salt and pepper" appearance is usually peripheral and does not significantly affect the Electroretinogram (ERG), whereas in hereditary dystrophies, the ERG is typically extinguished.

Q: Distant metastasis in Retinoblastoma is commonly seen in which of the following sites?

Brain. **Explanation:** Retinoblastoma (RB) is the most common intraocular malignancy of childhood. Understanding its spread is crucial for NEET-PG. **Why Brain is the Correct Answer:** Retinoblastoma spreads via three main routes: local extension, hematogenous spread, and lymphatic spread. The most common route of extraocular extension is **direct invasion along the optic nerve**. Once the tumor crosses the lamina cribrosa and reaches the subarachnoid space, it spreads via the **Cerebrospinal Fluid (CSF)** directly to the **Brain** and leptomeninges. This intracranial extension is the most frequent site of systemic involvement and a leading cause of mortality in these patients. **Analysis of Incorrect Options:** * **Long Bones (A):** While hematogenous spread can occur to the bone marrow and long bones (humerus, femur, skull), it is statistically less common than direct intracranial extension via the optic nerve. * **Lungs (B):** Unlike many adult sarcomas or carcinomas, the lungs are a relatively rare site for distant metastasis in Retinoblastoma. * **Liver (D):** Hematogenous spread to visceral organs like the liver can occur in advanced stages, but it is not the primary or most common site of distant involvement. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of distant metastasis:** Brain (via optic nerve/CSF). * **Most common site of hematogenous metastasis:** Bone marrow. * **Most common presenting sign:** Leukocoria (White pupillary reflex). * **Pathognomonic Histology:** Flexner-Wintersteiner rosettes (true rosettes with a central lumen). * **Genetics:** Mutation in the *RB1* gene on Chromosome **13q14**. * **Trilateral Retinoblastoma:** Bilateral RB associated with a pinealoblastoma (ectopic intracranial RB).

Q: A 56-year-old woman presents to the emergency room 3 hours after experiencing visual loss in her right eye. Her visual acuity is limited to light perception in the right eye. Examination reveals a pupillary defect, while the anterior surfaces of both eyes are normal. Fundus examination shows a cherry-red spot with a pale retina. What is the probable diagnosis?

Central retinal artery occlusion. ### Explanation **Correct Answer: D. Central Retinal Artery Occlusion (CRAO)** The clinical presentation is a classic textbook case of **Central Retinal Artery Occlusion**. The underlying pathophysiology involves a sudden blockage of the central retinal artery (usually by an embolus), leading to ischemia of the inner retinal layers. * **Sudden, painless loss of vision:** CRAO presents as a dramatic drop in visual acuity (often to Light Perception or Hand Movements) within seconds or minutes. * **Relative Afferent Pupillary Defect (RAPD):** This indicates significant optic nerve or extensive retinal ischemia. * **Cherry-red spot:** The hallmark sign. The fovea remains red because it is the thinnest part of the retina, allowing the underlying vascular choroid to show through. In contrast, the surrounding infarcted retina becomes opaque and milky-white (pale) due to intracellular edema. **Why the other options are incorrect:** * **A. Central Retinal Vein Occlusion (CRVO):** Characterized by a "blood and thunder" fundus with extensive flame-shaped hemorrhages, dilated tortuous veins, and disc edema, rather than a pale retina. * **B & C. Diabetic Retinopathy (Proliferative/Background):** These are chronic, progressive conditions. While they can cause vision loss (via vitreous hemorrhage or macular edema), they do not present with a sudden cherry-red spot and acute retinal pallor. **NEET-PG High-Yield Pearls:** * **"Time is Tissue":** CRAO is an ocular emergency. Irreversible retinal damage occurs within **90–100 minutes**. * **Management:** Immediate ocular massage, anterior chamber paracentesis, and IV acetazolamide to lower IOP and dislodge the embolus. * **Differential for Cherry-Red Spot:** CRAO, Tay-Sachs disease, Niemann-Pick disease, and Gaucher’s disease. * **Cilioretinal Artery:** In 15–20% of the population, this artery (spared in CRAO) may preserve a small island of central vision.

Q: A mother presents with a one-and-a-half-year-old child who has a one-month history of increasing proptosis of the left eye. Examination reveals a left eye white reflex. A computed tomography scan of the orbit shows a left orbital mass with calcification, mainly centered within the globe. What is the most likely diagnosis?

Retinoblastoma. **Explanation:** The clinical presentation of a young child (typically under 2 years) with **leukocoria** (white pupillary reflex) and **proptosis**, combined with CT findings of an **intraocular mass containing calcification**, is pathognomonic for **Retinoblastoma**. **1. Why Retinoblastoma is correct:** Retinoblastoma is the most common primary intraocular malignancy of childhood. The "hallmark" imaging feature on CT is **intraocular calcification** (seen in over 90% of cases). Proptosis indicates extraocular extension of the tumor. The age of the patient (1.5 years) fits the typical peak incidence. **2. Why other options are incorrect:** * **Congenital Cataract:** While it causes leukocoria, it is a lens opacity and does not present as a calcified orbital mass or cause proptosis. * **Endophthalmitis:** This is an inflammation of the inner coats of the eye. While it can cause a hazy reflex, it is usually associated with pain, redness, and a history of trauma or surgery, rather than a calcified mass. * **Coats Disease:** An idiopathic vascular anomaly (telangiectasia). While it causes leukocoria (due to exudative retinal detachment), it rarely shows calcification on CT and typically affects slightly older children (6–8 years). **Clinical Pearls for NEET-PG:** * **Imaging Gold Standard:** **MRI** is the preferred modality to assess optic nerve involvement and intracranial extension (trilateral retinoblastoma), but **CT** is superior for detecting calcification. * **Genetics:** Associated with the **RB1 gene** on chromosome **13q14**. * **Flexner-Wintersteiner Rosettes:** The characteristic histopathological finding. * **Differential Diagnosis of Leukocoria:** Always consider Retinoblastoma, Coats disease, Persistent Hyperplastic Primary Vitreous (PHPV), and Toxocariasis.

Q: A patient with HIV infection complains of rapidly progressive painless visual loss. Fundus shows exudates and haemorrhage especially along blood vessels. What is the treatment of choice in this case?

Ganciclovir. ### Explanation **Diagnosis: CMV Retinitis** The clinical presentation of rapidly progressive, painless vision loss in an HIV-positive patient (typically with a CD4 count <50 cells/mm³) featuring exudates and hemorrhages along the retinal vessels is characteristic of **Cytomegalovirus (CMV) Retinitis**. The classic funduscopic appearance is often described as a **"Pizza-pie"** or **"Cottage cheese and ketchup"** retinopathy. **Why Ganciclovir is the Correct Answer:** * **Ganciclovir** is the first-line treatment for CMV retinitis. It is a nucleoside analogue that inhibits viral DNA polymerase. * It can be administered intravenously or via intravitreal implants/injections for immediate local control. * **Valganciclovir** (the oral prodrug) is also used for induction and maintenance therapy. **Why Other Options are Incorrect:** * **Amphotericin B:** This is an antifungal agent used for systemic fungal infections like Cryptococcosis or Candidiasis. While HIV patients are prone to fungal infections, the vascular "pizza-pie" appearance is specific to CMV. * **Pentamidine:** This is used to treat *Pneumocystis jirovecii* pneumonia (PCP). It has no efficacy against viral retinitis. * **Acyclovir:** While an antiviral, it is primarily used for Herpes Simplex (HSV) and Varicella Zoster (VZV). It is ineffective against CMV because CMV lacks the viral thymidine kinase required to activate acyclovir. **High-Yield Clinical Pearls for NEET-PG:** * **Most common** opportunistic ocular infection in AIDS: CMV Retinitis. * **CD4 Threshold:** Usually occurs when CD4 count is **<50 cells/mm³**. * **Alternative treatments:** Foscarnet or Cidofovir (used if there is ganciclovir resistance). * **Key Complication:** Retinal detachment is a common sight-threatening complication of CMV retinitis. * **Differential:** Acute Retinal Necrosis (ARN) is caused by HSV/VZV and is usually painful, unlike CMV retinitis.

Q: What are the causes of exudative retinal detachment?

Harada's syndrome. **Explanation:** **Exudative Retinal Detachment (ERD)** occurs when fluid accumulates in the subretinal space due to damage to the Blood-Retinal Barrier (BRB) or the Retinal Pigment Epithelium (RPE), without any retinal breaks or traction. **Why Harada’s Syndrome is Correct:** Harada’s syndrome (part of Vogt-Koyanagi-Harada or VKH disease) is a multisystem autoimmune disorder characterized by granulomatous uveitis. The primary pathology involves intense inflammation of the choroid, leading to increased vascular permeability. This fluid leaks through the RPE into the subretinal space, causing a classic **multifocal exudative retinal detachment**. **Analysis of Incorrect Options:** * **Central Retinal Artery Occlusion (CRAO):** This is a vascular emergency causing inner retinal ischemia and edema (cloudy swelling). It typically presents with a "cherry-red spot" but does not cause fluid accumulation in the subretinal space or detachment. * **Hypertensive Retinopathy:** While severe (Grade IV) hypertension can cause exudates and disc edema, it is not a primary cause of ERD in the same way inflammatory or neoplastic conditions are. (Note: While *Toxemia of Pregnancy* can cause ERD, standard hypertensive retinopathy does not). **High-Yield Clinical Pearls for NEET-PG:** * **Shifting Fluid Sign:** This is the pathognomonic clinical feature of Exudative RD; the subretinal fluid moves to the most dependent part of the retina with changes in head position. * **Common Causes of ERD:** * **Inflammatory:** VKH syndrome, Posterior Scleritis. * **Neoplastic:** Choroidal Melanoma (most common intraocular tumor causing ERD), Metastasis. * **Vascular/Systemic:** Eclampsia, Chronic Renal Failure. * **Management:** Unlike Rhegmatogenous RD (which requires surgery), ERD is primarily managed by treating the **underlying systemic cause** (e.g., systemic steroids for VKH).

Question 1

What is the most common type of retinal detachment seen in proliferative diabetic retinopathy?

Accepted Answer

Tractional

Answer

Rhegmatogenous

Answer

Exudative

Answer

Retinoschisis

Question 2

Which of the following is NOT a treatment modality for wet age-related macular degeneration (ARMD)?

Accepted Answer

Panretinal photocoagulation

Answer

Anti-VEGF therapy

Answer

Photodynamic therapy

Answer

Macular grid photocoagulation

Question 3

The mother of a one and a half year old child gives a history of a white reflex from one eye for the past 1 month. On computed tomography scan of the orbit, calcification is seen within the globe. What is the most likely diagnosis?

Accepted Answer

Retinoblastoma

Answer

Congenital cataract

Answer

Endophthalmitis

Answer

Coats disease

Question 4

The "salt and pepper fundus" is a characteristic clinical finding in which of the following conditions?

Accepted Answer

Congenital syphilis

Answer

Multiple sclerosis

Answer

Cystinosis

Answer

Weill-Marchesani syndrome

Question 5

Distant metastasis in Retinoblastoma is commonly seen in which of the following sites?

Accepted Answer

Brain

Answer

Long bones

Answer

Lungs

Answer

Liver

Question 6

A 56-year-old woman presents to the emergency room 3 hours after experiencing visual loss in her right eye. Her visual acuity is limited to light perception in the right eye. Examination reveals a pupillary defect, while the anterior surfaces of both eyes are normal. Fundus examination shows a cherry-red spot with a pale retina. What is the probable diagnosis?

Accepted Answer

Central retinal artery occlusion

Answer

Central retinal vein occlusion

Answer

Proliferative diabetic retinopathy

Answer

Background diabetic retinopathy

Question 7

A mother presents with a one-and-a-half-year-old child who has a one-month history of increasing proptosis of the left eye. Examination reveals a left eye white reflex. A computed tomography scan of the orbit shows a left orbital mass with calcification, mainly centered within the globe. What is the most likely diagnosis?

Accepted Answer

Retinoblastoma

Answer

Congenital cataract

Answer

Endophthalmitis

Answer

Coats disease

Question 8

Recurrent toxoplasmic retinochoroiditis, all are true except:

Accepted Answer

The infestation is acquired by eating the undercooked meat of intermediate host containing cyst of the parasite

Answer

Manifests at an average age of 25 years

Answer

Typical lesion is a patch of focal necrotizing retinochoroiditis adjacent to a pigmented scar

Answer

There may be associated iritis

Question 9

A patient with HIV infection complains of rapidly progressive painless visual loss. Fundus shows exudates and haemorrhage especially along blood vessels. What is the treatment of choice in this case?

Accepted Answer

Ganciclovir

Answer

Amphotericin B

Answer

Pentamidine

Answer

Acyclovir

Question 10

What are the causes of exudative retinal detachment?

Accepted Answer

Harada's syndrome

Answer

Central retinal artery occlusion

Answer

Hypertensive retinopathy

Answer

All of the above

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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