Diseases of the Retina Practice Questions

Q: CRAO may be seen in which of the following conditions?

Orbital mucormycosis. **Explanation:** **Central Retinal Artery Occlusion (CRAO)** occurs when the main blood supply to the retina is obstructed. In the context of **Orbital Mucormycosis**, the mechanism is twofold: direct angioinvasion by the fungal hyphae into the vessel walls (leading to thrombosis) and mechanical compression due to orbital apex syndrome. Mucor has a strong predilection for internal elastic lamina of arteries, causing necrotizing vasculitis and subsequent ischemic infarction of the retina. **Analysis of Options:** * **Orbital Mucormycosis (Correct):** This is a fulminant fungal infection (often in diabetic or immunocompromised patients) that spreads from the sinuses to the orbit. It frequently causes CRAO via direct vascular invasion or compression at the orbital apex. * **Diabetes Mellitus:** While DM is a major risk factor for atherosclerosis and systemic vascular disease (which can lead to CRAO), it typically causes **Diabetic Retinopathy** (microangiopathy) rather than acute CRAO directly. * **CMV Retinitis:** This is a viral opportunistic infection (common in AIDS) that causes a "pizza-pie" appearance due to full-thickness retinal necrosis and hemorrhage, but it does not typically present as a primary CRAO. * **Panophthalmitis:** This is an intense inflammation of all coats of the eye, including the Tenon’s capsule. While it causes global ocular destruction, it is not a classic cause of isolated CRAO. **Clinical Pearls for NEET-PG:** * **Cherry Red Spot:** A classic sign of CRAO (the fovea remains red due to the underlying choroidal supply, while the surrounding retina turns milky white due to edema). * **Orbital Apex Syndrome:** Characterized by involvement of CN II, III, IV, VI, and the ophthalmic branch of V, often seen in Mucormycosis. * **Management:** CRAO is an ocular emergency. Immediate measures include digital ocular massage, anterior chamber paracentesis, and inhalation of Carbogen to induce vasodilation.

Q: Which of the following is NOT a differential diagnosis of Retinoblastoma?

Retinal detachment. **Explanation:** The question focuses on the differential diagnosis of **Leukocoria** (white pupillary reflex), which is the most common presenting sign of **Retinoblastoma (RB)**. **Why Retinal Detachment is the correct answer:** While Retinoblastoma can *cause* an exudative retinal detachment, a simple, isolated retinal detachment is generally not considered a primary differential for leukocoria in the same category as the others. In pediatric practice, "Leukocoria" refers to conditions that mimic the solid white mass of RB. While total detachment can appear pale, it lacks the characteristic calcified mass or vascular anomalies associated with the "pseudogliomas" listed in the other options. **Analysis of Incorrect Options (Pseudogliomas):** * **Persistent Hyperplastic Primary Vitreous (PHPV/PFV):** The most common mimic. It is usually unilateral and associated with a microphthalmic eye and a retrolental membrane. * **Coats Disease:** An idiopathic condition featuring telangiectatic retinal vessels and massive subretinal exudation. It is typically unilateral and occurs in slightly older male children. * **Retinal Astrocytoma:** A benign retinal tumor (often associated with Tuberous Sclerosis) that can appear as a "mulberry-like" white lesion, closely mimicking the endophytic growth of RB. **Clinical Pearls for NEET-PG:** * **Most common mimic of RB:** Persistent Hyperplastic Primary Vitreous (PHPV). * **Calcification:** The presence of intraocular calcification on CT/Ultrasound is highly suggestive of Retinoblastoma (found in 90% of cases). * **Flexner-Wintersteiner Rosettes:** Pathognomonic histological feature of Retinoblastoma. * **Other common differentials:** Toxocariasis (inflammatory granuloma), Retinopathy of Prematurity (ROP), and Familial Exudative Vitreoretinopathy (FEVR).

Q: In central serous retinopathy, which of the following is true?

Often shows focal leakage on fluorescein fundus photography. **Central Serous Retiopathy (CSR)** is characterized by a localized serous detachment of the neurosensory retina at the macula, caused by leakage from the choriocapillaris through a defect in the Retinal Pigment Epithelium (RPE). ### Why Option A is Correct: Fluorescein Angiography (FFA) is the gold standard for diagnosing CSR. It typically reveals **focal leakage** points. The two classic patterns are: 1. **Ink-blot appearance (Most common):** A small spot of leakage that gradually enlarges. 2. **Smoke-stack appearance (Pathognomonic):** Fluorescein rises vertically and then spreads laterally, resembling a plume of smoke. ### Why Other Options are Incorrect: * **Option B:** Macular holes are not a common complication of CSR. The fluid usually resorbs spontaneously. Chronic CSR may lead to RPE atrophy or subretinal fibrosis, but not typically a hole. * **Option C:** Patients with CSR experience **micropsia** (objects appearing smaller), not macropsia. This occurs because the subretinal fluid pushes the photoreceptors apart; when light hits these spread-out cells, the brain interprets the image as smaller. * **Option D:** The typical presentation is a **relative central scotoma** (a "dull" or "gray" spot), not a dense (absolute) scotoma. Other symptoms include metamorphopsia (distorted vision) and a sudden onset of mild-to-moderate blurring. ### High-Yield Clinical Pearls for NEET-PG: * **Demographics:** Classically affects young to middle-aged males with **Type A personalities**. * **Risk Factors:** Stress, **systemic steroid use** (most important association), and pregnancy. * **OCT Finding:** Shows a "double hump" sign or neurosensory detachment with subretinal fluid. * **Management:** Most cases are self-limiting and resolve in 3–4 months. If persistent, options include Micropulse Laser or Photodynamic Therapy (PDT).

Q: A 6-year-old male presents with findings on a blood smear examination. Which of the following ocular conditions is most likely to be associated with this patient?

Retinitis pigmentosa. ***Retinitis pigmentosa*** - **Abetalipoproteinemia** (Bassen-Kornzweig syndrome) indicated by **acanthocytes** on blood smear is associated with **pigmentary retinopathy** resembling retinitis pigmentosa. - This **autosomal recessive disorder** causes **fat-soluble vitamin deficiencies** (A, D, E, K), leading to progressive **retinal degeneration** and night blindness. *Hypertensive retinopathy* - Occurs due to **chronic hypertension** causing **arteriovenous nicking**, **flame-shaped hemorrhages**, and **cotton wool spots**. - Unlikely in a **6-year-old child** without systemic hypertension, and not associated with **acanthocytes** on blood smear. *Sickle cell retinopathy* - Associated with **sickle-shaped red blood cells** on blood smear, not **acanthocytes** (spiny red cells). - Presents with **proliferative retinopathy**, **sea fan neovascularization**, and **retinal detachment** due to vaso-occlusive episodes. *Purtscher retinopathy* - Typically occurs following **severe trauma**, **chest compression**, or **acute pancreatitis** causing **cotton wool spots** and **retinal hemorrhages**. - Not associated with **metabolic disorders** or **acanthocytes** on blood smear, and uncommon in pediatric patients without trauma history.

Q: A 40-year-old male with diabetes mellitus presents with vitreous hemorrhage. What is the most important cause for it?

Neovascularization of the disc. ### **Explanation** The correct answer is **Neovascularization of the disc (NVD)**. **1. Why Neovascularization of the disc is correct:** In a patient with diabetes mellitus, chronic retinal ischemia leads to the release of **VEGF** (Vascular Endothelial Growth Factor). This triggers **Proliferative Diabetic Retinopathy (PDR)**, characterized by the formation of fragile, new blood vessels (neovascularization) at the optic disc (NVD) or elsewhere (NVE). These vessels lack a proper basement membrane and are prone to bleeding into the vitreous cavity, especially during vitreous contraction. **PDR is the most common cause of spontaneous vitreous hemorrhage** in adults. **2. Why other options are incorrect:** * **Posterior Vitreous Detachment (PVD):** While a common cause of vitreous hemorrhage in the general elderly population (due to retinal vessel tearing), in a **diabetic patient**, neovascularization is the primary pathological concern. * **Central Retinal Vein Occlusion (CRVO):** While CRVO can lead to neovascularization (Ischemic CRVO), it is a separate clinical entity. The question specifies a diabetic patient, making diabetic-induced NVD the more direct and likely cause. * **Trauma to the Central Retinal Artery:** Trauma is an external cause and does not relate to the underlying pathophysiology of diabetes. Furthermore, CRA trauma usually leads to ischemia/infarction rather than hemorrhage. **3. NEET-PG High-Yield Pearls:** * **Most common cause of Vitreous Hemorrhage (Overall):** Trauma. * **Most common cause of Spontaneous Vitreous Hemorrhage:** Proliferative Diabetic Retinopathy. * **Clinical Sign:** "Fresh" vitreous hemorrhage presents as a sudden, painless loss of vision with a "black rain" or "cobweb" appearance (floaters). * **Management:** B-Scan ultrasonography is mandatory if the fundus is not visible to rule out retinal detachment.

Q: Soft exudates are found in all of the following conditions except?

Retinopathy of Prematurity. **Explanation:** **Soft exudates**, also known as **Cotton Wool Spots (CWS)**, are not true exudates. They represent micro-infarctions of the retinal nerve fiber layer (RNFL) caused by the occlusion of terminal retinal arterioles. This leads to the cessation of axoplasmic flow and the accumulation of transported material (cytoid bodies) in the nerve fibers. **Why Retinopathy of Prematurity (ROP) is the correct answer:** ROP is characterized by peripheral retinal ischemia leading to **pathological neovascularization** at the junction of vascularized and non-vascularized retina. While ischemia is present, the hallmark lesions are the "line," "ridge," and "extraretinal fibrovascular proliferation." Soft exudates are typically absent in ROP because the immature retinal vasculature in neonates does not manifest the same focal arteriolar occlusive pattern seen in adult vascular diseases. **Analysis of Incorrect Options:** * **Diabetic Retinopathy:** CWS are a hallmark of Pre-proliferative Diabetic Retinopathy (PPDR), signifying significant retinal ischemia. * **Hypertensive Retinopathy:** CWS appear in Grade III (Modified Scheie Classification) or "Accelerated/Malignant" hypertension due to acute arteriolar damage. * **CMV Retinitis:** This viral infection causes full-thickness retinal necrosis. The borders of the necrotic areas often appear as white, fluffy opacities resembling soft exudates (the "pizza-pie" appearance). **High-Yield Clinical Pearls for NEET-PG:** * **Hard Exudates:** Composed of lipoproteins/lipids; located in the Outer Plexiform Layer (Henle’s layer in the macula); caused by chronic vascular leakage (e.g., NPDR). * **Soft Exudates (CWS):** Located in the Nerve Fiber Layer; caused by acute arteriolar occlusion. * **Other conditions with CWS:** HIV retinopathy (most common finding), Anemia, Leukemia, and Systemic Lupus Erythematosus (SLE).

Q: Dot and blot hemorrhages and flame-shaped hemorrhages can be characteristically seen in which of the following conditions?

Diabetic retinopathy. **Explanation:** The correct answer is **Diabetic Retinopathy (DR)**. **1. Why Diabetic Retinopathy is correct:** In DR, chronic hyperglycemia leads to capillary basement membrane thickening and pericyte loss, resulting in microvascular leakage. * **Dot and Blot Hemorrhages:** These occur in the deeper layers of the retina (Inner Nuclear and Outer Plexiform layers). Because the cells are packed vertically here, the blood is confined into small, round shapes. * **Flame-shaped Hemorrhages:** These occur in the superficial Nerve Fiber Layer (NFL). The blood follows the horizontal orientation of the nerve fibers, giving them a feathered or "flame" appearance. While more classic for hypertension, they are frequently seen in DR as well. **2. Why other options are incorrect:** * **Hypertensive Retinopathy:** Characteristically shows flame-shaped hemorrhages, cotton wool spots, and hard exudates. While dot-blots can occur, they are not the primary hallmark compared to DR. * **Retinitis Pigmentosa:** A degenerative disease characterized by the triad of **bony spicule pigmentation**, arteriolar attenuation, and waxy disc pallor. Hemorrhages are not a feature. * **Central Retinal Artery Occlusion (CRAO):** Presents with sudden painless loss of vision, a **"Cherry Red Spot"** at the macula, and a ground-glass (milky white) retina due to edema. Hemorrhages are typically absent (unlike CRVO, which shows "blood and thunder" fundus). **High-Yield Clinical Pearls for NEET-PG:** * **Earliest clinical sign of DR:** Microaneurysms (seen in the Inner Nuclear Layer). * **Dot/Blot Hemorrhages** = Deep retina; **Flame Hemorrhages** = Superficial retina (NFL). * **Pre-proliferative DR** is characterized by Intraretinal Microvascular Abnormalities (IRMA) and venous beading. * **Proliferative DR** is defined by the presence of **Neovascularization** (NVD/NVE).

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

Retinoblastoma. **Explanation:** The clinical presentation of a **white pupillary reflex (Leukocoria)** in a child under the age of two, combined with the hallmark finding of **intraocular calcification** on CT scan, is pathognomonic for **Retinoblastoma**. **Why Retinoblastoma is correct:** Retinoblastoma is the most common primary intraocular malignancy of childhood. The most frequent presenting sign is leukocoria (60%). The tumor cells undergo rapid necrosis and outgrow their blood supply, leading to the deposition of calcium (dystrophic calcification). CT scan is highly sensitive in detecting this "chalky white" calcification, which occurs in approximately 90% of cases. **Why the other options are incorrect:** * **Congenital Cataract:** While it is the most common cause of leukocoria, it does not present with intraocular calcification on imaging. * **Endophthalmitis:** This is an inflammatory/infectious condition. While it can cause a hazy vitreous or "pseudoglioma," calcification is not a standard feature. * **Coats Disease:** This is a vascular anomaly (telangiectasia) usually seen in slightly older male children (8–10 years). While it causes leukocoria due to exudative retinal detachment, calcification is rare, helping to differentiate it from Retinoblastoma. **High-Yield Clinical Pearls for NEET-PG:** * **Most common sign:** Leukocoria; **Second most common:** Strabismus. * **Imaging of choice:** USG (B-scan) or CT scan to look for calcification. MRI is preferred to evaluate optic nerve involvement and pineal gland (Trilateral Retinoblastoma). * **Genetics:** Mutation in the **RB1 gene** on chromosome **13q14**. * **Pathology:** Look for **Flexner-Wintersteiner rosettes** (highly specific). * **Management:** Small tumors are treated with cryotherapy/laser; large tumors or those with no vision potential require enucleation. Chemotherapy (VEC protocol: Vincristine, Etoposide, Carboplatin) is used for chemoreduction.

Q: Angioid streaks are seen in which of the following conditions?

Pseudoxanthoma elasticum. **Explanation:** **Angioid streaks** are irregular, jagged, radiating lines deep to the retina that resemble blood vessels. They represent **crack-like dehiscences in a thickened, calcified Bruch’s membrane**. **1. Why Pseudoxanthoma Elasticum (PXE) is correct:** PXE (Grönblad-Strandberg syndrome) is the most common systemic association of angioid streaks. It is a genetic disorder characterized by progressive calcification and fragmentation of elastic fibers in the skin, eyes, and cardiovascular system. The calcification makes Bruch’s membrane brittle, leading to the characteristic "streaks." A classic clinical sign in these patients is "plucked chicken skin" appearance on the neck or axilla. **2. Why the other options are incorrect:** * **Options A, C, and D (Xanthomas/Xanthelasma):** These are localized accumulations of lipid-laden macrophages (foam cells) usually associated with hyperlipidemia. While they are important dermatological markers of systemic lipid metabolism disorders, they do not involve the calcification of Bruch’s membrane and are not associated with angioid streaks. **3. High-Yield Clinical Pearls for NEET-PG:** To remember the causes of Angioid Streaks, use the mnemonic **PEPSI**: * **P:** **P**seudoxanthoma elasticum (Most common) * **E:** **E**hlers-Danlos syndrome * **P:** **P**aget’s disease of bone * **S:** **S**ickle cell anemia (and other hemoglobinopathies like Thalassemia) * **I:** **I**diopathic **Key Complication:** The most vision-threatening complication of angioid streaks is **Choroidal Neovascularization (CNV)**, which can lead to subretinal hemorrhage and macular scarring. Patients should be monitored with Amsler grids.

Question 1

CRAO may be seen in which of the following conditions?

Accepted Answer

Orbital mucormycosis

Answer

Diabetes mellitus

Answer

CMV retinitis

Answer

Panophthalmitis

Question 2

Which of the following is NOT a differential diagnosis of Retinoblastoma?

Accepted Answer

Retinal detachment

Answer

Persistent hyperplastic primary vitreous

Answer

Coats disease

Answer

Retinal astrocytoma

Question 3

In central serous retinopathy, which of the following is true?

Accepted Answer

Often shows focal leakage on fluorescein fundus photography

Answer

A macular hole is a common end result

Answer

The image perceived by the patient on the affected side in unilateral cases is bigger than on the normal side

Answer

A dense central scotoma is the most common presentation

Question 4

A 6-year-old male presents with findings on a blood smear examination. Which of the following ocular conditions is most likely to be associated with this patient?

Accepted Answer

Retinitis pigmentosa

Answer

Hypertensive retinopathy

Answer

Sickle cell retinopathy

Answer

Purtschner retinopathy

Question 5

A 40-year-old male with diabetes mellitus presents with vitreous hemorrhage. What is the most important cause for it?

Accepted Answer

Neovascularization of the disc

Answer

Posterior vitreous detachment

Answer

Central retinal vein occlusion

Answer

Trauma to the central retinal artery

Question 6

Soft exudates are found in all of the following conditions except?

Accepted Answer

Retinopathy of Prematurity

Answer

Diabetic Retinopathy

Answer

Hypertensive Retinopathy

Answer

CMV Retinitis

Question 7

Dot and blot hemorrhages and flame-shaped hemorrhages can be characteristically seen in which of the following conditions?

Accepted Answer

Diabetic retinopathy

Answer

Hypertensive retinopathy

Answer

Retinitis pigmentosa

Answer

Central retinal artery occlusion

Question 8

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

Accepted Answer

Retinoblastoma

Answer

Congenital cataract

Answer

Endophthalmitis

Answer

Coats disease

Question 9

All of the following are true about central retinal artery occlusion (CRAO) except:

Accepted Answer

Sudden, painless loss of vision.

Answer

Most commonly occurs due to a thromboembolus.

Answer

Anterior chamber paracentesis is used for treatment.

Answer

Occurs due to obstruction of the retinal artery at the level of the lamina cribrosa.

Question 10

Angioid streaks are seen in which of the following conditions?

Accepted Answer

Pseudoxanthoma elasticum

Answer

Tendinous xanthoma

Answer

Xanthelasma

Answer

Eruptive xanthoma

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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