Diseases of the Retina Practice Questions

Q: Shifting fluid is pathognomonic of which condition?

Solid retinal detachment. **Explanation:** **Shifting fluid** is a hallmark clinical sign of **Exudative (Serous) Retinal Detachment**, which is frequently caused by a **Solid Retinal Detachment** (e.g., secondary to an intraocular tumor like Choroidal Melanoma). ### Why Solid Retinal Detachment is Correct: In exudative detachment, fluid accumulates in the subretinal space due to damage to the blood-retinal barrier or secretion from a tumor. Since there is no physical break (hole) or traction holding the retina, the subretinal fluid is free to move under the influence of gravity. When the patient changes position, the fluid shifts to the most dependent part of the eye, causing the detachment to "shift" location. This is pathognomonic for exudative/solid etiologies. ### Why Other Options are Incorrect: * **Rhegmatogenous RD:** Caused by a break/hole in the retina. The fluid is usually relatively static or moves very slowly; it does not demonstrate the rapid gravitational shifting seen in exudative cases. * **Tractional RD:** Caused by fibrovascular membranes (e.g., Diabetic Retinopathy) pulling the retina. The detachment is concave, fixed, and does not shift with position. * **Choroidal Detachment:** This involves fluid in the suprachoroidal space (between the choroid and sclera). It presents as a smooth, brown, lobulated elevation, but "shifting fluid" is specifically a descriptor for subretinal fluid in RD. ### NEET-PG High-Yield Pearls: * **Exudative RD:** Characterized by shifting fluid and a smooth, convex surface without a retinal break. * **Rhegmatogenous RD:** Most common type; characterized by a retinal break, "tobacco dust" (Shafer’s sign) in the vitreous, and a corrugated appearance. * **Tractional RD:** Most common cause is Proliferative Diabetic Retinopathy (PDR); it is the only RD that is **concave** in configuration.

Q: A one-year-old child presents with leucocoria and is found to have a unilateral, large retinoblastoma filling half the globe. What is the current recommended therapy?

Enucleation. **Explanation:** The management of Retinoblastoma (RB) is guided by the **International Classification of Retinoblastoma (ICRB)**. The primary goal is to save life, followed by the eye, and then vision. **1. Why Enucleation is Correct:** In this case, the child has a **unilateral, large tumor** filling half the globe. This corresponds to **Group E** (very high risk) or advanced **Group D** disease. When a tumor is unilateral and there is no hope for useful vision (due to size or location), **Enucleation** remains the gold standard. It ensures complete removal of the tumor and allows for histopathological examination to check for high-risk features like optic nerve or choroidal involvement. **2. Why Incorrect Options are Wrong:** * **Option B:** Chemotherapy (Chemoreduction) followed by local therapy is the treatment of choice for **bilateral cases** (to save the better eye) or smaller unilateral tumors (Groups A, B, and C) where vision can be salvaged. * **Option C:** Direct laser ablation (Photocoagulation/TTT) is only indicated for very small, posterior tumors (usually <3mm in diameter and 2mm in thickness). * **Option D:** Radiotherapy (External Beam or Scleral Plaque) is generally reserved as a secondary treatment due to the high risk of radiation-induced secondary malignancies (like osteosarcoma) in these children. **Clinical Pearls for NEET-PG:** * **Most common intraocular tumor** of childhood. * **Leucocoria** (Amaurotic cat’s eye reflex) is the most common presentation. * **Calcification** (seen on USG/CT) is a hallmark of Retinoblastoma. * **Flexner-Wintersteiner rosettes** are pathognomonic histological features. * The **RB1 gene** is located on chromosome **13q14**.

Q: Macular involvement is a common finding in which of the following conditions?

Cytomegalovirus (CMV). **Explanation:** **Cytomegalovirus (CMV) Retinitis** is the most common opportunistic ocular infection in patients with AIDS (typically when CD4 counts fall below 50 cells/µL). It is characterized by a necrotizing retinitis that spreads along the retinal vessels. A hallmark of CMV retinitis is its predilection for the posterior pole, frequently involving the **macula** and the optic nerve. This leads to profound, irreversible vision loss if not treated promptly with Ganciclovir or Foscarnet. **Analysis of Options:** * **Toxoplasma (Option A):** While *Toxoplasma gondii* causes retinochoroiditis, it typically presents as a focal "headlight in the fog" lesion. While it can occur at the macula, CMV is statistically more "commonly" associated with extensive posterior pole involvement in the context of systemic immunosuppression. * **Malaria (Option B):** Malarial retinopathy (seen in cerebral malaria) involves retinal whitening, vessel changes, and hemorrhages, but primary macular necrotizing retinitis is not its defining feature. * **Syphilis (Option C):** Known as "The Great Imitator," syphilis can cause various forms of uveitis and placoid chorioretinitis, but it is less common than CMV in modern clinical practice for isolated macular-predominant necrotizing retinitis. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Appearance:** CMV retinitis is often described as **"Pizza-pie"** or **"Cottage cheese and ketchup"** appearance due to the mix of white retinal necrosis and red hemorrhages. * **Brush-fire Border:** The infection typically has a granular, advancing edge. * **Frosted Branch Angiitis:** A severe form of retinal vasculitis that can be seen in CMV. * **Treatment of Choice:** Induction and maintenance with **Intravenous Ganciclovir**; Intravitreal injections are used for immediate sight-threatening (macular) lesions.

Q: Calcification in retinoblastoma is due to?

RPE metaplasia. **Explanation:** The presence of calcification is a hallmark feature of **Retinoblastoma**, occurring in approximately 90% of cases. **Why RPE Metaplasia is Correct:** While dystrophic calcification often occurs within areas of tumor necrosis, the specific mechanism involving the surrounding tissues is **Retinal Pigment Epithelium (RPE) metaplasia**. In retinoblastoma, the RPE can undergo reactive changes and metaplasia, leading to the deposition of calcium salts. This is often visualized on imaging (CT scan) as "chalky white" densities and is a critical diagnostic sign (Pathognomonic) for the tumor in a child with leukocoria. **Why Other Options are Incorrect:** * **Necrosis:** While necrosis leads to *dystrophic* calcification, it is the secondary result of the tumor outgrowing its blood supply. In the context of specific cellular transformations leading to mineral deposition in this pathology, RPE metaplasia is the recognized histological driver. * **Hemorrhage:** Hemorrhage may occur within the tumor or vitreous, but it typically leads to hemosiderin deposition or organization, not the characteristic calcification seen in RB. * **Scleral Rupture:** This is a late-stage complication indicating extraocular extension; it is a structural failure and does not cause the intratumoral calcification. **High-Yield Pearls for NEET-PG:** * **Most common intraocular malignancy** in children. * **Leukocoria (Amaurotic cat’s eye reflex):** Most common presenting sign. * **Flexner-Wintersteiner Rosettes:** Highly specific histological finding (lumen contains cytoplasmic extensions). * **Homer-Wright Rosettes:** Seen in RB but also in neuroblastoma and medulloblastoma (no central lumen). * **Imaging of Choice:** **B-scan Ultrasonography** (initial) and **CT scan** (to detect calcification). MRI is preferred to evaluate optic nerve involvement and pinealoblastoma (Trilateral RB).

Q: What is the most characteristic eye lesion in diabetes mellitus?

Capillary aneurysm. **Explanation:** **Microaneurysms (Capillary aneurysms)** are the hallmark and the **earliest clinically detectable sign** of Diabetic Retinopathy (DR). They occur due to the loss of intramural pericytes, which weakens the capillary wall, leading to focal saccular outpouchings. On fundoscopy, they appear as tiny, round, red dots, usually located in the inner nuclear layer of the retina. Their presence is essential for the diagnosis of Background Diabetic Retinopathy (BDR). **Analysis of Incorrect Options:** * **A. Flame hemorrhages:** These are characteristic of **Hypertensive Retinopathy**. In diabetes, hemorrhages are typically "dot and blot" (located in the deeper retinal layers), whereas flame-shaped hemorrhages occur in the superficial nerve fiber layer. * **B. Papilledema:** This refers to optic disc swelling due to increased intracranial pressure. While diabetics can develop "Diabetic Papillopathy," it is not a characteristic or common finding compared to microaneurysms. * **C. Cataracts:** While diabetes accelerates cataract formation (specifically "Snowflake cataract" in young diabetics or early senile cataracts), it is a secondary complication and not as pathognomonic or "characteristic" of the disease process as microaneurysms. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Pathological Change:** Basement membrane thickening. * **Earliest Clinical Sign:** Microaneurysms. * **First Sign on FFA:** Microaneurysms appear as "hyperfluorescent dots." * **Pericyte:Endothelial Cell Ratio:** Changes from the normal 1:1 to 1:20 in diabetes. * **Cotton Wool Spots:** Indicate focal retinal ischemia (pre-proliferative stage).

Q: Amster grid is used in which type of examination?

Detecting maculopathy. **Explanation:** The **Amsler Grid** is a simple, non-invasive clinical tool used primarily to monitor the central **10 degrees** of the visual field. It is the gold standard for the bedside screening and self-monitoring of **maculopathy**. **Why Option A is correct:** The macula is responsible for central, high-resolution vision. When there is fluid (edema), blood, or subretinal neovascularization (as seen in Wet ARMD), the retinal architecture is distorted. This leads to **metamorphopsia** (distortion of straight lines) or **scotomas** (blind spots), which the patient perceives while viewing the grid. It is most commonly used in Age-Related Macular Degeneration (ARMD) and Central Serous Chorioretinopathy (CSCR). **Why other options are incorrect:** * **Optic disc examination:** This is typically performed using direct/indirect ophthalmoscopy or slit-lamp biomicroscopy (90D lens). Functional assessment of the optic nerve involves visual acuity, pupillary reaction (RAPD), and perimetry (HVF). * **Squint assessment:** Evaluated using the Hirschberg corneal reflex test, Cover-Uncover tests, and Prism Bar Cover Test (PBCT). * **General retinal examination:** This requires a wider field of view, achieved via Indirect Ophthalmoscopy or peripheral retinal imaging. **High-Yield Clinical Pearls for NEET-PG:** * **Metamorphopsia:** The earliest symptom of maculopathy detectable by Amsler Grid. * **Testing Distance:** The grid is held at a normal reading distance (**30 cm**) with near-correction glasses on. * **The "Watzke-Allen" Sign:** Another clinical test for macular holes using a slit-lamp beam. * **Micropsia vs. Macropsia:** Edema (pushing photoreceptors apart) causes micropsia; retinal scarring (pulling them together) can cause macropsia.

Question 1

Shifting fluid is pathognomonic of which condition?

Accepted Answer

Solid retinal detachment

Answer

Rhegmatogenous retinal detachment

Answer

Tractional retinal detachment

Answer

Choroidal detachment

Question 2

A one-year-old child presents with leucocoria and is found to have a unilateral, large retinoblastoma filling half the globe. What is the current recommended therapy?

Accepted Answer

Enucleation

Answer

Chemotherapy followed by local therapies

Answer

Direct laser ablation using photodynamic therapy

Answer

Scleral radiotherapy followed by chemotherapy

Question 3

Macular involvement is a common finding in which of the following conditions?

Accepted Answer

Cytomegalovirus (CMV)

Answer

Toxoplasma

Answer

Malaria

Answer

Syphilis

Question 4

Calcification in retinoblastoma is due to?

Accepted Answer

RPE metaplasia

Answer

Necrosis

Answer

Hemorrhage

Answer

Scleral rupture

Question 5

What is the best treatment for a patient with a retinal condition requiring intervention?

Accepted Answer

Three monthly injections of Ranibizumab

Answer

Laser photocoagulation

Answer

Photodynamic therapy

Answer

Observation and follow-up

Question 6

Dot and blot (round) retinal haemorrhages are situated at the level of which layer of the retina?

Accepted Answer

Outer plexiform layer

Answer

Ganglion cell layer

Answer

Nerve fibre layer

Answer

Inner nuclear layer

Question 7

A 75-year-old woman with diabetes mellitus and congestive heart failure has a sudden loss of vision in her left eye. Funduscopic examination shows a cherry-red appearance of the foveola, whereas the remaining retina appears pale. No abnormalities of the right eye are noted. Which of the following is the most likely cause for her sudden unilateral visual loss?

Accepted Answer

Central retinal artery occlusion

Answer

Cytomegalovirus retinitis

Answer

Primary angle-closure glaucoma

Answer

Proliferative retinopathy

Question 8

Degree of diabetic retinopathy depends on which of the following?

Accepted Answer

Duration of diabetes

Answer

Type of diabetes

Answer

Severity of hyperglycemia

Answer

Retinal involvement

Question 9

What is the most characteristic eye lesion in diabetes mellitus?

Accepted Answer

Capillary aneurysm

Answer

Flame hemorrhages

Answer

Papilledema

Answer

Cataracts

Question 10

Amster grid is used in which type of examination?

Accepted Answer

Detecting maculopathy

Answer

Optic disc examination

Answer

Squint assessment

Answer

General retinal examination

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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