Diseases of the Retina Practice Questions

Q: In the context of retinal conditions, what is the primary cause of shifting fluid beneath the retina?

Exudative Retinal detachment. ***Exudative Retinal detachment*** - This condition is characterized by the accumulation of **serous fluid** beneath the retina without a retinal break, causing the retina to detach. The fluid can shift with changes in head position due to gravity, leading to a **"shifting fluid" phenomenon**. - It results from conditions that compromise the **retinal pigment epithelium (RPE)** or choroidal vasculature, such as **choroidal tumors**, **inflammatory diseases**, or **severe hypertension**, leading to leakage of fluid. *Tractional Retinal Detachment* - This type of detachment occurs when **fibrovascular membranes** on the retinal surface contract and pull the neurosensory retina away from the RPE. - The detachment is usually **immobile** or minimally mobile because it is held in place by fibrous adhesions, and therefore, does not typically exhibit shifting fluid. *Rhegmatogenous retinal detachment* - This is the most common type of retinal detachment and occurs due to a **full-thickness break or tear** in the retina, allowing vitreous fluid to pass into the subretinal space. - While fluid is present, the key feature is a retinal break, and the detached retina is typically more fixed by the flow through the break rather than gravitationally shifting. *Retinodialysis* - Retinodialysis is a specific type of **rhegmatogenous retinal detachment** characterized by a **disinsertion of the retina from its ora serrata attachment**, often due to trauma. - Similar to other rhegmatogenous detachments, fluid accumulates in the subretinal space, but the primary cause is the tear/disinsertion, and it doesn't primarily manifest as a shifting fluid characteristic, which is more indicative of exudative causes.

Q: Keith Wagener classification is for?

Hypertensive retinopathy. ***Hypertensive retinopathy*** - The **Keith-Wagner classification** (or Keith-Wagener-Barker classification) is a historical grading system used to describe the severity of **hypertensive retinopathy**. - It categorizes retinal changes into four grades based on findings like **arteriolar narrowing**, **hemorrhages**, **exudates**, and **papilledema**, correlating them with the patient's prognosis. *Diabetic maculopathy* - **Diabetic maculopathy** is classified using systems like the ETDRS (Early Treatment Diabetic Retinopathy Study) criteria, focusing on the presence of **edema**, **exudates**, and **ischemia** in the macula. - While both relate to vascular damage, the specific classifications and features differ significantly. *CRVO* - **Central Retinal Vein Occlusion (CRVO)** is typically classified based on its **ischemic** or **non-ischemic** status, determined by fluorescein angiography and visual acuity. - The Keith-Wagner classification is not used for grading CRVO. *CRAO* - **Central Retinal Artery Occlusion (CRAO)** is primarily diagnosed by the sudden, profound vision loss and retinal whitening, often with a **cherry-red spot** on the macula. - There isn't a widely used grading classification system for CRAO analogous to Keith-Wagner.

Q: All of the following are causes of exudative retinal detachment except:

Retinopathy of prematurity. ***Retinopathy of prematurity*** - This condition primarily causes retinal detachment through **vitreoretinal traction** due to abnormal vessel proliferation and subsequent fibrosis, classifying it as **tractional retinal detachment**, not exudative. - The abnormal vessel growth in the peripheral retina leads to scarring and contracture, pulling the retina away from the underlying RPE. *Retinopathy of toxemia of pregnancy* - This is an **exudative retinal detachment** involving accumulation of fluid beneath the retina due to choroidal ischemia and impaired integrity of the retinal pigment epithelium. - The systemic hypertension and endothelial dysfunction in preeclampsia/eclampsia lead to choroidal vasculopathy and subsequent fluid leakage into the subretinal space. *Exudative retinopathy of Coats* - This condition is characterized by congenital abnormal retinal telangiectatic vessels that leak fluid and lipids, leading to massive **subretinal exudation** and subsequent retinal detachment. - It is a classic example of **exudative retinal detachment** occurring predominantly in young males with yellowish subretinal exudates. *Sympathetic ophthalmia* - This is a rare bilateral granulomatous panuveitis following penetrating ocular trauma that can lead to diffuse **chorioretinal inflammation** and **exudative retinal detachment**. - The autoimmune inflammation causes fluid leakage from choroidal vessels into the subretinal space, similar to Vogt-Koyanagi-Harada syndrome.

Q: Vitrectomy should be considered if the vitreous haemorrhage is not absorbed within:

3 months. ***3 months*** - Vitrectomy is typically considered if a **vitreous hemorrhage** does not clear within **3 months** to prevent complications like **retinal detachment** or **hemosiderosis**. - Prolonged vitreous hemorrhage can lead to **fibrous proliferation**, which can cause **tractional retinal detachment**. *1 month* - This period is generally too short to consider surgical intervention unless there are signs of **retinal detachment** or other urgent complications. - Many **vitreous hemorrhages** can spontaneously resolve within this timeframe, especially if they are small. *6 months* - Waiting this long to perform a **vitrectomy** for a persistent **vitreous hemorrhage** would be considered a delay. - This delay could lead to increased risks of **permanent vision loss** due to **hemosiderosis** or the progression of **proliferative vitreoretinopathy**. *2 months* - While closer to the recommended timeline, **2 months** may still be too early to definitively conclude that the hemorrhage will not resolve spontaneously. - However, if there are specific concerns or if the hemorrhage is dense, earlier intervention might be considered.

Q: Subretinal haemorrhage at the macula in myopia is known as?

Foster Fuchs spot. ***Foster Fuchs spot*** - This refers to a **subretinal hemorrhage** or **pigmentary change** at the macula due to choroidal neovascularization, a common complication in **pathologic myopia**. - It is a specific clinical sign indicating severe retinal damage and potential vision loss in highly myopic eyes. *Lacquer cracks* - These are **breaks in Bruch's membrane** that appear as fine, yellow-white lines in the fundus. - While they can lead to choroidal neovascularization and hemorrhage in myopic eyes, **lacquer cracks themselves are not the hemorrhage**. *Staphyloma* - A staphyloma is an **outpouching or ectasia of the sclera** (often with choroid and retina) due to thinning and weakening of the scleral wall. - It is a structural abnormality related to high myopia but does not directly describe a subretinal hemorrhage at the macula. *Macular retinoschisis* - This is a **splitting of the retinal layers**, typically in the outer plexiform layer, and is common in high myopia. - It leads to fluid accumulation within the retina, but it is a **separation of retinal layers, not a hemorrhage**.

Q: What is the definition of trilateral retinoblastoma?

Bilateral retinoblastoma with pineoblastoma. ***Bilateral retinoblastoma with pineoblastoma*** - **Trilateral retinoblastoma** is a rare and aggressive form of retinoblastoma that occurs when a bilateral retinoblastoma is accompanied by a **pineoblastoma** (a primitive neuroectodermal tumor of the pineal gland). - This condition is typically associated with **hereditary retinoblastoma**, caused by germline mutations in the *RB1* gene. *Bilateral retinoblastoma with medulloblastoma* - While medulloblastoma is another type of **primitive neuroectodermal tumor (PNET)**, the specific combination for trilateral retinoblastoma is with a **pineoblastoma**, not medulloblastoma. - Medulloblastoma is a common pediatric brain tumor, but its co-occurrence with retinoblastoma does not define trilateral retinoblastoma. *Bilateral retinoblastoma with neuroblastoma* - **Neuroblastoma** is a distinct type of childhood cancer that originates from **neural crest cells**, often found in the adrenal glands or sympathetic nervous system. - This combination is not recognized as **trilateral retinoblastoma**, which specifically involves a pineal region tumor. *Bilateral retinoblastoma with ependymoma* - **Ependymoma** is a brain tumor that arises from the **ependymal lining** of the ventricles and spinal cord. - This particular association is not the definition of **trilateral retinoblastoma**, which is specifically linked to a tumor of the pineal gland.

Q: Which part of the eye is primarily affected by Abetalipoproteinemia?

Retina. ***Retina*** - Abetalipoproteinemia leads to a severe deficiency of **fat-soluble vitamins**, especially **vitamin A** and **vitamin E**, which are crucial for retinal health. - This deficiency causes a progressive **retinopathy**, particularly affecting the photoreceptors, leading to **night blindness** and eventual loss of central vision. *Retinal pigment epithelium* - While the **retinal pigment epithelium (RPE)** supports photoreceptor function, the primary and most significant damage in abetalipoproteinemia directly impacts the photoreceptors of the retina itself. - Although the RPE can be secondarily affected due to photoreceptor degeneration, it is not the initial or primary site of pathology. *Choroid* - The **choroid** is a vascular layer that provides oxygen and nutrients to the outer retina, but it is not directly affected by the vitamin deficiencies in abetalipoproteinemia. - Damage to the choroid is not a characteristic feature of this disease. *Optic nerve* - The **optic nerve** transmits visual information from the retina to the brain, and while severe retinal damage can eventually compromise its function, it is not the primary site of pathology in abetalipoproteinemia. - The initial and most direct impact of the vitamin deficiencies is on the retina.

Q: Which gas is most commonly used with pneumatic retinopexy?

C3F8. ***C3F8*** - **Perfluoropropane (C3F8)** is commonly used in pneumatic retinopexy due to its longer expansion time and greater final volume compared to other gases. - Its prolonged presence in the vitreous cavity allows for sustained tamponade, which is crucial for successful reattachment of the retina in cases of **rhegmatogenous retinal detachment**. *SF6* - **Sulfur hexafluoride (SF6)** is also used in retinal surgery but has a shorter half-life and smaller final volume compared to C3F8. - While effective, its quicker absorption means less sustained tamponade, making it less ideal for pneumatic retinopexy where prolonged tamponade is often desired. *CO2* - **Carbon dioxide (CO2)** is not used for pneumatic retinopexy as it is highly soluble and rapidly absorbed, providing inadequate and non-sustained tamponade. - It is sometimes used during vitrectomy to induce gas-fluid exchange but not as a long-term tamponade agent. *N2* - **Nitrogen (N2)** is not used as a tamponade gas in pneumatic retinopexy. - Medical gases for vitreoretinal surgery are typically fluorinated gases (like SF6 and C3F8) with specific properties for safe and effective intraocular use.

Q: What is a common symptom associated with vitreous hemorrhage?

Sudden loss of vision without pain. ***Sudden loss of vision without pain*** - **Vitreous hemorrhage** often presents as an acute, **painless loss of vision** due to blood obscuring the light path to the retina. - Patients may describe **floaters**, **cobwebs**, or a **reddish tint** to their vision, indicating blood in the vitreous cavity. *Sudden loss of vision with pain* - **Sudden vision loss with pain** is more characteristic of conditions like **acute angle-closure glaucoma** or **optic neuritis**. - Vitreous hemorrhage itself is not typically associated with ocular pain unless there's an underlying painful condition like **neovascular glaucoma**. *Gradual loss of vision with pain* - **Gradual vision loss with pain** is rare and not typical for vitreous hemorrhage. - Painful, gradual vision loss might suggest chronic inflammatory conditions or certain **orbital pathologies**. *Gradual loss of vision without pain* - **Gradual, painless vision loss** is often seen in conditions like **cataracts**, **chronic open-angle glaucoma**, or **diabetic retinopathy without acute hemorrhage**. - Vitreous hemorrhage usually manifests with a more acute onset of symptoms.

Q: Retinoblastoma can occur bilaterally in what percentage of cases?

25-30%. ***25-30%*** - Approximately **25-30%** of retinoblastoma cases are **bilateral**, which is typically associated with the **germline (heritable)** form of the disease. - Patients with bilateral retinoblastoma are at higher risk for **second primary cancers** later in life. *10-15%* - This percentage is too low; **bilateral retinoblastoma** occurs more frequently than this. - A lower incidence of bilateral cases would suggest a stronger predominance of the **sporadic (non-heritable) form**. *15-20%* - This percentage does not accurately reflect the established prevalence of **bilateral retinoblastoma**. - While it's within the range of bilateral occurrences, it underestimates the true frequency. *20-25%* - While closer, this range still slightly underestimates the actual proportion of **bilateral retinoblastoma cases**. - The higher range accounts for cases arising from new germline mutations in addition to inherited ones.

Question 1

In the context of retinal conditions, what is the primary cause of shifting fluid beneath the retina?

Accepted Answer

Exudative Retinal detachment

Answer

Tractional Retinal Detachment

Answer

Rhegmatogenous retinal detachment

Answer

Retinodialysis

Question 2

Keith Wagener classification is for?

Accepted Answer

Hypertensive retinopathy

Answer

CRVO

Answer

CRAO

Answer

Diabetic maculopathy

Question 3

All of the following are causes of exudative retinal detachment except:

Accepted Answer

Retinopathy of prematurity

Answer

Retinopathy of toxemia of pregnancy

Answer

Sympathetic ophthalmia

Answer

Exudative retinopathy of Coats

Question 4

Vitrectomy should be considered if the vitreous haemorrhage is not absorbed within:

Accepted Answer

3 months

Answer

1 month

Answer

6 months

Answer

2 months

Question 5

Subretinal haemorrhage at the macula in myopia is known as?

Accepted Answer

Foster Fuchs spot

Answer

Lacquer cracks

Answer

Staphyloma

Answer

Macular retinoschisis

Question 6

What is the definition of trilateral retinoblastoma?

Accepted Answer

Bilateral retinoblastoma with pineoblastoma

Answer

Bilateral retinoblastoma with medulloblastoma

Answer

Bilateral retinoblastoma with neuroblastoma

Answer

Bilateral retinoblastoma with ependymoma

Question 7

Which part of the eye is primarily affected by Abetalipoproteinemia?

Accepted Answer

Retina

Answer

Retinal pigment epithelium

Answer

Choroid

Answer

Optic nerve

Question 8

Which gas is most commonly used with pneumatic retinopexy?

Accepted Answer

C3F8

Answer

CO2

Answer

N2

Answer

SF6

Question 9

What is a common symptom associated with vitreous hemorrhage?

Accepted Answer

Sudden loss of vision without pain

Answer

Sudden loss of vision with pain

Answer

Gradual loss of vision with pain

Answer

Gradual loss of vision without pain

Question 10

Retinoblastoma can occur bilaterally in what percentage of cases?

Accepted Answer

25-30%

Answer

15-20%

Answer

10-15%

Answer

20-25%

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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