Ocular Manifestations of Systemic Disorders — MCQs

Ocular Manifestations of Systemic Disorders Indian Medical PG Practice Questions and MCQs

Question 61: Epidemic dropsy is characterised by all EXCEPT:

A. Disc edema
B. Hard exudates (Correct Answer)
C. Peri retinal haemorrhage
D. Tortuous retinal vessels

Explanation: **Explanation:** Epidemic dropsy is a clinical condition caused by the ingestion of mustard oil adulterated with **Argemone mexicana** oil. The toxic alkaloid responsible is **Sanguinarine**, which increases capillary permeability and causes widespread vasodilation. **Why "Hard Exudates" is the correct answer:** Hard exudates are composed of lipoprotein deposits resulting from chronic vascular leakage (commonly seen in Diabetic Retinopathy). In Epidemic Dropsy, the ocular pathology is primarily driven by **acute hypervolemia and massive capillary dilation** rather than chronic lipid leakage. Therefore, hard exudates are not a feature of this condition. **Analysis of Incorrect Options:** * **Tortuous retinal vessels & Periretinal hemorrhage:** Sanguinarine inhibits the Na+-K+ ATPase pump, leading to a rise in intracellular calcium and the release of prostaglandins. This causes extreme dilatation and tortuosity of retinal vessels and increased fragility, leading to superficial (periretinal) hemorrhages. * **Disc edema:** The systemic toxicity leads to increased capillary permeability and venous congestion, which manifests as bilateral optic disc edema (papilledema). **High-Yield Clinical Pearls for NEET-PG:** 1. **Glaucoma Type:** It causes a specific type of **Open Angle Glaucoma** characterized by very high Intraocular Pressure (IOP), but notably, there is **no shallowing of the anterior chamber** and **no pain/redness**. 2. **Mechanism of Glaucoma:** Increased production of aqueous humor and increased resistance to outflow due to dilated capillaries in the uveal tract. 3. **Systemic Features:** Bilateral pitting edema of legs, diarrhea, and cardiac failure. 4. **Diagnosis:** The **Nitric Acid Test** or Marquis test is used to detect Argemone oil in mustard oil.

Question 62: Which of the following is the most common cause of anterior uveitis?

A. Idiopathic (Correct Answer)
B. HLA-B27 associated
C. Sarcoidosis
D. Tuberculosis

Explanation: **Explanation:** Anterior uveitis (comprising iritis and iridocyclitis) is the most common form of intraocular inflammation. Epidemiological studies consistently show that despite extensive diagnostic workups, **Idiopathic** causes remain the most frequent, accounting for approximately **50% or more** of all cases. **Why the other options are incorrect:** * **HLA-B27 associated:** While this is the most common *identifiable* systemic association (linked to Ankylosing Spondylitis, Reiter’s Syndrome, and IBD), it still ranks second to idiopathic cases in overall prevalence. * **Sarcoidosis:** This is a significant cause of granulomatous uveitis (often presenting with "mutton-fat" keratic precipitates), but it is statistically less common than HLA-B27 or idiopathic varieties. * **Tuberculosis:** Though a major cause of infectious uveitis in developing countries like India, it is a specific etiology and does not surpass the frequency of idiopathic presentations. **High-Yield Clinical Pearls for NEET-PG:** * **Most common type of uveitis:** Anterior Uveitis. * **Most common systemic association:** HLA-B27 (typically presents as acute, unilateral, recurrent, non-granulomatous inflammation). * **Granulomatous vs. Non-granulomatous:** Idiopathic and HLA-B27 cases are usually non-granulomatous (small KPs), whereas Sarcoidosis and TB are typically granulomatous (large mutton-fat KPs). * **Classic Triad of Symptoms:** Pain, photophobia, and redness (ciliary congestion). * **Gold Standard Treatment:** Topical corticosteroids (e.g., Prednisolone acetate) and cycloplegics (e.g., Homatropine) to prevent synechiae.

Question 63: What is the most common benign tumor of the eyelids?

A. Simple papilloma (Correct Answer)
B. Xanthelasma
C. Capillary haemangioma
D. Neurofibroma

Explanation: **Explanation:** **1. Why Simple Papilloma is Correct:** Simple papilloma (specifically the squamous cell papilloma) is the **most common benign tumor of the eyelids**. It is a slow-growing, painless lesion that can be either sessile or pedunculated. These tumors arise from the proliferation of the squamous epithelium and often have a characteristic "raspberry" or "cauliflower" appearance. They are frequently seen in elderly patients or as viral warts (Verruca vulgaris) in younger individuals. **2. Analysis of Incorrect Options:** * **Xanthelasma:** While very common, it is technically a **lipid deposit** (histiocytes containing cholesterol) within the dermis rather than a true neoplastic tumor. It is often associated with hyperlipidemia. * **Capillary Haemangioma:** This is the most common benign orbital/eyelid tumor of **childhood** (infancy), but it is not the most common in the general population. * **Neurofibroma:** These are associated with Neurofibromatosis Type 1 (NF-1). While they can present as a "S-shaped" deformity of the eyelid (Plexiform neurofibroma), they are significantly less common than simple papillomas. **3. NEET-PG High-Yield Pearls:** * **Most common malignant tumor of the eyelid:** Basal Cell Carcinoma (BCC), typically involving the lower lid. * **Most common site for BCC:** Lower eyelid > Inner canthus > Upper eyelid. * **Sebaceous Gland Carcinoma:** A highly malignant tumor that often mimics chronic chalazion or blepharoconjunctivitis (Masquerade syndrome). * **Hutchinson’s Freckle:** A precursor to Lentigo Maligna (Melanoma).

Question 64: What is the cause of acute vision loss in a patient with alcoholic pancreatitis?

A. Puscher's retinopathy (Correct Answer)
B. Sudden alcohol withdrawal
C. Acute congestive glaucoma
D. Central retinal artery occlusion (CRAO)

Explanation: **Explanation:** **Purtscher’s Retinopathy** is the correct answer. It is a rare but well-recognized microvascular occlusive syndrome characterized by sudden, painless vision loss. While classically associated with severe head trauma or chest compression, it is a known complication of **acute pancreatitis**. The underlying pathophysiology involves the activation of the complement cascade (specifically C5a), leading to leukocyte aggregation and the formation of microemboli (granulocyte/platelet/fibrin clumps). These emboli cause infarction of the retinal nerve fiber layer, manifesting clinically as multiple **Purtscher flecken** (areas of retinal whitening) and cotton-wool spots surrounding the optic nerve. **Why other options are incorrect:** * **Sudden alcohol withdrawal:** Typically presents with systemic neurological symptoms (tremors, seizures, delirium tremens) rather than acute structural retinal pathology or vision loss. * **Acute congestive glaucoma:** Presents with a painful red eye, corneal edema, and a mid-dilated pupil, rather than the painless retinal findings associated with pancreatitis. * **Central retinal artery occlusion (CRAO):** While it causes sudden vision loss, it is usually due to an embolus from the heart or carotid arteries. In CRAO, the entire retina is pale with a "cherry-red spot," whereas Purtscher’s shows localized patches of whitening (flecken). **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Purtscher’s:** Sudden vision loss + Purtscher flecken + Cotton-wool spots. * **Common Causes:** Trauma (most common), Acute Pancreatitis, Fat Embolism Syndrome, and Systemic Lupus Erythematosus (SLE). * **Diagnosis:** Primarily clinical; Fundus Fluorescein Angiography (FFA) shows areas of capillary non-perfusion. * **Management:** Observation and treatment of the underlying systemic condition (e.g., managing the pancreatitis).

Question 65: Heterochromia iridis is a feature of:

A. Malignant melanoma of iris
B. Sympathetic paralysis
C. Glaucomatocyclitis crisis
D. All of the above (Correct Answer)

Explanation: **Explanation:** **Heterochromia iridis** refers to a difference in the color of the iris between the two eyes (complete) or within a single iris (sectoral). It occurs due to an alteration in the density or distribution of melanocytes within the iris stroma. **Why "All of the above" is correct:** 1. **Malignant Melanoma of Iris:** This is a neoplastic cause of **hyperchromic** heterochromia. The proliferation of malignant melanocytes increases the pigment density, making the affected iris appear darker than the normal side. 2. **Sympathetic Paralysis (Horner’s Syndrome):** The sympathetic nervous system is essential for the development and maintenance of iris pigmentation. Congenital Horner’s syndrome leads to **hypochromic** heterochromia (the affected eye is lighter) because the melanocytes fail to mature without sympathetic stimulation. 3. **Glaucomatocyclitis Crisis (Posner-Schlossman Syndrome):** Recurrent episodes of acute intraocular pressure spikes and mild anterior uveitis can lead to iris atrophy over time. This loss of iris stroma and pigment results in a lighter-colored iris (**hypochromic** heterochromia) in the affected eye. **High-Yield Clinical Pearls for NEET-PG:** * **Fuchs’ Heterochromic Iridocyclitis (FHI):** The most common cause of heterochromia in clinical practice. It typically presents as a lighter-colored iris (hypochromic) with fine, stellate Keratic Precipitates (KPs) and a high risk of cataract and glaucoma. * **Siderosis Bulbi:** A retained iron intraocular foreign body can cause the iris to turn rusty brown (**hyperchromic**). * **Latanoprost (Prostaglandin analogues):** A common pharmacological cause of increased iris pigmentation (**hyperchromic**). * **Waardenburg Syndrome:** A systemic cause featuring heterochromia, white forelock, and sensorineural deafness.

Question 66: Which syndrome is characterized by the following ocular finding?

A. Moebius syndrome
B. Alagille syndrome
C. Treacher Collins syndrome
D. Goldenhar's syndrome (Correct Answer)

Explanation: ***Goldenhar's syndrome*** - Characterized by **epibulbar (limbal) dermoids**, typically located at the **inferotemporal limbus** as shown in the image. - Part of the **oculo-auriculo-vertebral spectrum** with associated **microtia**, **preauricular tags**, and **vertebral anomalies**. *Moebius syndrome* - Primary feature is **congenital facial paralysis** due to **cranial nerve VI and VII palsy**, not limbal dermoids. - Ocular findings include **limited horizontal eye movements** and **lagophthalmos**, but no epibulbar masses. *Alagille syndrome* - Characterized by **posterior embryotoxon** (prominent Schwalbe's line) and **retinal pigmentary changes**. - Associated with **liver disease**, **cardiac defects**, and **butterfly vertebrae**, but no limbal dermoids. *Treacher Collins syndrome* - Ocular findings include **downslanting palpebral fissures**, **lower eyelid colobomas**, and **absent lower eyelashes**. - Features **mandibular hypoplasia** and **external ear malformations**, but epibulbar dermoids are not characteristic.

Question 67: All are causes of chronic granulomatous uveitis EXCEPT:

A. Sarcoidosis
B. Tuberculosis
C. Brucellosis
D. Fuchs heterochromic iridocyclitis (Correct Answer)

Explanation: **Explanation:** Uveitis is clinically classified into **granulomatous** and **nongranulomatous** types based on the nature of the inflammatory infiltrate. Granulomatous uveitis is typically chronic and characterized by large, "mutton-fat" keratic precipitates (KPs), Koeppe and Busacca nodules, and is usually associated with systemic infections or autoimmune conditions. **Why Fuchs Heterochromic Iridocyclitis (FHI) is the correct answer:** FHI is a chronic, low-grade, typically unilateral **nongranulomatous** uveitis. Despite its chronic nature, it presents with fine, stellate, diffuse KPs distributed over the entire corneal endothelium, rather than the large, greasy mutton-fat KPs seen in granulomatous disease. It is unique because it lacks typical signs of inflammation like synechiae or redness. **Analysis of Incorrect Options:** * **Sarcoidosis:** A classic cause of bilateral granulomatous uveitis. It presents with mutton-fat KPs, iris nodules, and "string of pearls" vitreous opacities. * **Tuberculosis:** A common infectious cause of granulomatous uveitis in India. It can present as disseminated choroiditis or focal granulomas (tuberculomas). * **Brucellosis:** A zoonotic infection known to cause chronic granulomatous inflammation affecting the posterior segment (multifocal choroiditis) and anterior segment. **NEET-PG High-Yield Pearls:** * **FHI Triad:** Heterochromia iris (affected eye is usually lighter), cataract, and glaucoma. * **Mutton-fat KPs:** Composed of epithelioid cells and macrophages (pathognomonic for granulomatous uveitis). * **Vogt-Koyanagi-Harada (VKH) Syndrome:** Another high-yield cause of bilateral chronic granulomatous uveitis associated with poliosis and vitiligo. * **Syphilis:** Known as the "Great Mimicker," it can cause both granulomatous and nongranulomatous uveitis.

Question 68: Which of the following statements is not true regarding uveitis?

A. Intermediate uveitis involves the pars plana.
B. Festooned pupil is associated with posterior synechiae.
C. Arlt's line is a triangle-shaped aggregation of Keratic precipitates. (Correct Answer)
D. Polychromatic luster is a complication of uveitis.

Explanation: **Explanation:** The correct answer is **C** because it incorrectly defines **Arlt’s line**. In ophthalmology, Arlt’s line is a horizontal scar found in the upper palpebral conjunctiva, specifically in the sulcus subtarsalis, and is a pathognomonic sign of **Chlamydia trachomatis (Trachoma)** infection. The description provided in the option—a triangle-shaped aggregation of Keratic Precipitates (KPs) on the posterior corneal endothelium—actually refers to **Mutton-fat KPs** arranged in **Arlt’s Triangle**, typically seen in granulomatous uveitis. **Analysis of other options:** * **Option A:** Intermediate uveitis primarily affects the **pars plana** (pars planitis), the vitreous, and the peripheral retina. It is a classic site-specific classification. * **Option B:** A **festooned pupil** occurs when posterior synechiae (adhesions between the iris and the anterior lens capsule) are present. When the pupil is dilated with a mydriatic, it assumes an irregular, scalloped shape because the adhered points cannot dilate. * **Option C:** **Polychromatic luster** at the posterior pole of the lens is the earliest sign of a **complicated cataract**, a common sequela of chronic anterior uveitis. **High-Yield Clinical Pearls for NEET-PG:** * **Arlt’s Triangle:** Base-down triangular distribution of KPs due to convection currents in the anterior chamber and gravity. * **Busacca Nodules:** Located on the iris surface (granulomatous uveitis). * **Koeppe Nodules:** Located at the pupillary margin (seen in both granulomatous and non-granulomatous uveitis). * **Hypopyon:** Sterile collection of WBCs in the anterior chamber, common in HLA-B27 associated uveitis and Behçet’s disease.

Question 69: Which of the following can cause lid retraction?

A. Graves' ophthalmopathy
B. Hypokalemic periodic paralysis
C. Cirrhosis of the liver
D. All of the above (Correct Answer)

Explanation: **Explanation:** Lid retraction (Dalrymple’s sign) occurs when the upper eyelid rests at or above the superior limbus, exposing the sclera. This can result from myogenic, neurogenic, or mechanical causes. 1. **Graves’ Ophthalmopathy:** This is the most common cause of lid retraction. It occurs due to **sympathetic overactivity** of Müller’s muscle and inflammatory fibrosis/contraction of the Levator Palpebrae Superioris (LPS) muscle. 2. **Hypokalemic Periodic Paralysis:** During an attack, patients may exhibit lid retraction. This is thought to be due to a **hyper-excitable state** of the muscle membrane or a compensatory over-action of the levator muscle during periods of generalized muscle weakness. 3. **Cirrhosis of the Liver:** This is a classic systemic association known as **Summerskill’s sign**. The exact mechanism is not fully understood but is attributed to increased sympathetic activity and high levels of circulating amines (like tyramine) that the cirrhotic liver fails to metabolize. **Clinical Pearls for NEET-PG:** * **Collier’s Sign:** Lid retraction due to a lesion in the midbrain (Parinaud’s Syndrome). * **Pseudo-lid retraction:** Can occur in contralateral ptosis (Hering’s Law of equal innervation) or in unilateral high myopia/buphthalmos. * **Kocher’s Sign:** Staring look on fixed gaze. * **Von Graefe’s Sign:** Lid lag on downgaze (characteristic of thyroid eye disease). Since all three conditions listed are documented causes of lid retraction, the correct answer is **D**.

Question 70: Vascular invasion is commonly seen in which of the following ocular tumors?

A. Retinoblastoma
B. Malignant melanoma (Correct Answer)
C. Optic nerve gliomas
D. Medullo-epitheliomas

Explanation: **Explanation:** **Malignant Melanoma** of the uvea is the most common primary intraocular malignancy in adults. Its hallmark feature is its high propensity for **hematogenous spread** (vascular invasion). Unlike many other tumors, uveal melanoma lacks a lymphatic drainage system; therefore, it spreads primarily through the bloodstream. The tumor cells invade the rich vascular network of the choroid, frequently metastasizing to the **liver** (the most common site of distant metastasis). Histologically, the presence of "vascular loops" or high microvascular density is a significant prognostic indicator for metastasis. **Why other options are incorrect:** * **Retinoblastoma:** While it is the most common intraocular tumor in children, it primarily spreads via **direct extension** through the optic nerve to the CNS or via the subarachnoid space. Hematogenous spread occurs late and is less characteristic than direct neural invasion. * **Optic Nerve Gliomas:** These are benign, slow-growing tumors (usually pilocytic astrocytomas) associated with Neurofibromatosis Type 1. They spread by local expansion along the nerve sheath rather than vascular invasion. * **Medullo-epitheliomas (Diktyoma):** These are rare congenital tumors arising from the ciliary body epithelium. They are usually locally invasive but rarely exhibit systemic vascular metastasis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of metastasis for Uveal Melanoma:** Liver (>90% of cases). * **Callender Classification:** Used for prognosis in melanoma (Spindle A, Spindle B, Mixed, and Epithelioid; Epithelioid has the worst prognosis). * **Genetic Marker:** Monosomy 3 is a strong predictor of metastatic potential in uveal melanoma. * **Treatment of choice:** Plaque radiotherapy (Brachytherapy) for medium-sized tumors; Enucleation for large tumors.

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Diabetes Mellitus

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Hypertension

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Autoimmune Disorders

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Thyroid Disease

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HIV and AIDS

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Hematological Disorders

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Neurological Disorders

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Dermatological Conditions

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Metabolic Disorders

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Ocular Toxicity of Systemic Medications

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Infectious Systemic Diseases

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