Diseases of the Retina Practice Questions

Q: A 45-year-old woman with diabetes presents with worsening vision. Fundoscopy reveals proliferative diabetic retinopathy. Which treatment option has been shown to be effective in reducing the risk of severe vision loss?

Panretinal photocoagulation. ***Panretinal photocoagulation*** - This treatment uses a laser to create burns in the peripheral retina, destroying ischemic tissue and reducing the production of **vascular endothelial growth factor (VEGF)**, thereby preventing new, fragile blood vessel formation and ultimately reducing the risk of severe vision loss in **proliferative diabetic retinopathy (PDR)**. - PRP is the standard of care for severe non-proliferative and proliferative diabetic retinopathy to prevent progression to **vitreous hemorrhage** or **tractional retinal detachment**. - **Note**: Intravitreal anti-VEGF therapy (bevacizumab, ranibizumab, aflibercept) is also highly effective for PDR and may be used as an alternative or adjunct to PRP in current practice. *Focal laser treatment* - **Focal laser photocoagulation** primarily targets specific leaking microaneurysms in the macula to treat **diabetic macular edema (DME)**, which causes central vision loss. - It is not the primary treatment for proliferative retinopathy where new blood vessel growth (neovascularization) is the main concern. *Vitrectomy* - **Vitrectomy** is a surgical procedure performed to remove blood from a **vitreous hemorrhage** or to repair a **tractional retinal detachment** that has already occurred as a complication of advanced proliferative diabetic retinopathy. - While effective for these complications, it is a surgical intervention for existing damage rather than a primary preventative treatment to reduce the risk of initial severe vision loss from developing PDR. *Intravitreal corticosteroids* - **Intravitreal corticosteroids** are typically used to treat **diabetic macular edema (DME)**, especially in cases unresponsive to anti-VEGF therapy. - While they can reduce inflammation and leakage, they are not the primary treatment for preventing the progression of neovascularization in proliferative diabetic retinopathy.

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: 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: 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: 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: 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: 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: 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: 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.

Q: Most common primary intraocular neoplasm in a child is?

Retinoblastoma. ***Retinoblastoma*** - **Retinoblastoma** is the **most common primary intraocular malignancy in children**, typically presenting before the age of 5. - It arises from **immature retinal cells** and can be inherited (germline mutation) or sporadic. *Metastasis* - **Metastasis** to the eye is rare in children and is typically associated with advanced, widespread cancers from other primary sites. - While possible, it is not considered the primary intraocular neoplasm of highest incidence in this age group. *Basal cell carcinoma* - **Basal cell carcinoma** is a **skin cancer** that rarely occurs in children and almost exclusively affects sun-exposed areas like the eyelids, not primarily intraocular structures. - It is an **epithelial tumor** and does not originate from intraocular tissues. *Squamous cell carcinoma* - **Squamous cell carcinoma** is another type of **skin cancer**, more common in older adults with significant UV exposure, and is exceedingly rare as a primary intraocular tumor, especially in children. - Like basal cell carcinoma, it primarily affects the skin, including the eyelids, rather than the internal eye.

Question 1

A 45-year-old woman with diabetes presents with worsening vision. Fundoscopy reveals proliferative diabetic retinopathy. Which treatment option has been shown to be effective in reducing the risk of severe vision loss?

Accepted Answer

Panretinal photocoagulation

Answer

Focal laser treatment

Answer

Vitrectomy

Answer

Intravitreal corticosteroids

Question 2

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 3

Subretinal haemorrhage at the macula in myopia is known as?

Accepted Answer

Foster Fuchs spot

Answer

Lacquer cracks

Answer

Staphyloma

Answer

Macular retinoschisis

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

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 6

Keith Wagener classification is for?

Accepted Answer

Hypertensive retinopathy

Answer

CRVO

Answer

CRAO

Answer

Diabetic maculopathy

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

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 9

Retinoblastoma can occur bilaterally in what percentage of cases?

Accepted Answer

25-30%

Answer

15-20%

Answer

10-15%

Answer

20-25%

Question 10

Most common primary intraocular neoplasm in a child is?

Accepted Answer

Retinoblastoma

Answer

Metastasis

Answer

Basal cell carcinoma

Answer

Squamous cell carcinoma

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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