Ocular Manifestations of Systemic Disorders — MCQs

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

Question 141: Proptosis is not seen in which of the following conditions?

A. Primary thyrotoxicosis
B. Sarcoidosis
C. Pituitary adenoma
D. Hypothyroidism (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Hypothyroidism**. **1. Why Hypothyroidism is the correct answer:** Proptosis (protrusion of the eyeball) is primarily caused by space-occupying lesions or inflammatory swelling within the bony orbit. In **Hypothyroidism**, the characteristic ocular finding is **periorbital edema** (puffy eyelids) and occasionally ptosis, but not proptosis. While Graves' Ophthalmopathy is associated with hyperthyroidism, it is an autoimmune process; simple underactivity of the thyroid gland does not cause the retrobulbar fat hypertrophy or extraocular muscle enlargement required to push the eye forward. **2. Analysis of Incorrect Options:** * **A. Primary Thyrotoxicosis:** This is the most common cause of both unilateral and bilateral proptosis in adults (Graves' Disease). It involves autoimmune-mediated enlargement of extraocular muscles and deposition of glycosaminoglycans in the retrobulbar space. * **B. Sarcoidosis:** This is a multisystem granulomatous disease that can involve the **lacrimal gland** (causing dacryoadenitis) or result in orbital granulomas, both of which can lead to proptosis. * **C. Pituitary Adenoma:** Large tumors (macroadenomas) can invade the **cavernous sinus**. This leads to venous congestion or direct mass effect, resulting in proptosis, alongside cranial nerve palsies (III, IV, VI). **Clinical Pearls for NEET-PG:** * **Most common cause of Bilateral Proptosis (Adults):** Graves' Disease. * **Most common cause of Unilateral Proptosis (Adults):** Thyroid Eye Disease (Graves'). * **Most common cause of Proptosis in Children:** Orbital Cellulitis (Inflammatory) or Rhabdomyosarcoma (Malignant). * **Dalrymple’s Sign:** Widening of the palpebral fissure due to lid retraction in thyrotoxicosis. * **Exophthalmometry:** Measured using a **Hertel exophthalmometer**; values >21mm or an asymmetry of >2mm are significant.

Question 142: Which of the following is NOT a prognostic factor in choroidal melanoma?

A. Presence of retinal detachment (Correct Answer)
B. Size of tumor
C. Cytology of tumor cells
D. Presence of extraocular extension

Explanation: **Explanation:** In Choroidal Melanoma, prognosis is primarily determined by the tumor's potential for metastasis (most commonly to the liver). **Why Retinal Detachment is the correct answer:** While an exudative (serous) retinal detachment is a very common **clinical presentation** of choroidal melanoma, it is **not a prognostic factor** for survival or metastasis. It occurs due to fluid leakage from the tumor vessels into the subretinal space but does not reflect the biological aggressiveness or the stage of the malignancy. **Analysis of Incorrect Options (Prognostic Factors):** * **Size of Tumor (Option B):** This is the most important clinical prognostic factor. Larger tumors (measured by basal diameter and height) have a significantly higher risk of metastasis. * **Cytology (Option C):** The **Callender Classification** is used here. **Epithelioid cells** have the worst prognosis, while **Spindle A** cells have the best. Presence of "closed vascular loops" on histopathology also indicates a poor prognosis. * **Extraocular Extension (Option D):** Extension of the tumor through the sclera into the orbit significantly worsens the prognosis and increases the risk of systemic spread. **High-Yield Clinical Pearls for NEET-PG:** * **Most common primary intraocular malignancy in adults:** Choroidal Melanoma. * **Most common site of metastasis:** Liver (90% of cases). * **Genetic Marker:** Monosomy 3 is the most significant genetic predictor of poor prognosis (high metastatic risk). * **Investigation of Choice:** B-Scan Ultrasonography (shows "Hollow" internal reflectivity and "Choroidal excavation"). * **Treatment:** Plaque radiotherapy (Brachytherapy) is preferred for small/medium tumors; Enucleation is reserved for large tumors or those involving the optic nerve.

Question 143: Diabetes mellitus can lead to which of the following ocular complications?

A. Vitreous haemorrhage
B. Rubeosis iridis
C. Retinal detachment
D. All of the above (Correct Answer)

Explanation: **Explanation:** Diabetes Mellitus is a multisystem metabolic disorder that primarily affects the eye through **Diabetic Retinopathy (DR)**. The underlying pathophysiology involves chronic hyperglycemia leading to microvascular damage, capillary occlusion, and subsequent retinal ischemia. **Why "All of the above" is correct:** The progression of Diabetic Retinopathy leads to the release of **Vascular Endothelial Growth Factor (VEGF)**, which triggers **Neovascularization** (formation of fragile new vessels). These new vessels are the root cause of the listed complications: * **Vitreous Haemorrhage (Option A):** New vessels on the retina (NVE) or optic disc (NVD) are fragile and bleed easily into the vitreous gel, causing sudden painless vision loss. * **Rubeosis Iridis (Option B):** Ischemia-induced VEGF diffuses into the anterior segment, causing neovascularization of the iris (Rubeosis Iridis). This can progress to **Neovascular Glaucoma (NVG)** by obstructing the aqueous outflow. * **Retinal Detachment (Option C):** In Proliferative Diabetic Retinopathy (PDR), fibrovascular membranes form along with the new vessels. These membranes contract, exerting a pull on the retina, leading to **Tractional Retinal Detachment (TRD)**. **Clinical Pearls for NEET-PG:** * **Earliest Clinical Sign:** Microaneurysms (found in the Inner Nuclear Layer). * **Earliest Pathological Change:** Loss of pericytes and basement membrane thickening. * **Most Common Cause of Vision Loss:** Diabetic Macular Edema (DME), which can occur at any stage of DR. * **Classification:** The presence of neovascularization marks the transition from Non-Proliferative (NPDR) to Proliferative Diabetic Retinopathy (PDR). * **Management:** Pan-retinal photocoagulation (PRP) is the gold standard for PDR to reduce the ischemic drive.

Question 144: What is the ocular manifestation of ankylosing spondylitis?

A. Cataract
B. Retinal detachment
C. Anterior uveitis (Correct Answer)
D. Glaucoma

Explanation: **Explanation:** **Ankylosing Spondylitis (AS)** is a chronic inflammatory seronegative spondyloarthropathy strongly associated with the **HLA-B27** allele. The most common extra-articular manifestation of AS is **Acute Anterior Uveitis (AAU)**, occurring in approximately 25–40% of patients. **Why Anterior Uveitis is correct:** The underlying mechanism involves an autoimmune-mediated inflammation of the uveal tract (specifically the iris and ciliary body). In AS, the uveitis is characteristically **acute, unilateral (though it can alternate eyes), and recurrent.** Patients typically present with sudden onset of pain, redness (ciliary congestion), photophobia, and blurred vision. On examination, "mutton-fat" keratic precipitates are usually absent; instead, fine KPs and a significant cellular reaction in the anterior chamber are seen. **Why other options are incorrect:** * **A. Cataract:** While cataracts (specifically complicated cataracts) can occur as a *secondary complication* of chronic uveitis or prolonged steroid use, they are not the primary manifestation of AS. * **B. Retinal detachment:** This is not typically associated with AS. Retinal issues are more common in high myopia or trauma. * **C. Glaucoma:** Similar to cataracts, secondary glaucoma can occur due to synechiae formation or steroid therapy, but it is a complication rather than the hallmark manifestation. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic:** HLA-B27 is associated with **PAIR** (Psoriatic arthritis, Ankylosing spondylitis, Inflammatory bowel disease, and Reactive arthritis)—all of which can cause anterior uveitis. * **Treatment:** The mainstay of treatment for AS-associated uveitis is **topical corticosteroids** and **cycloplegics** (to prevent posterior synechiae). * **Key Sign:** Look for "bamboo spine" in the clinical vignette to point towards AS.

Question 145: A patient with rheumatoid arthritis, on long-term NSAID treatment (diclofenac) for joint pain, presents with reduced visual acuity and loss of colour vision. What is the likely diagnosis?

A. Open angle glaucoma
B. Angle closure glaucoma
C. Optic neuritis (Correct Answer)
D. Senile cataract

Explanation: **Explanation:** The correct answer is **Optic Neuritis**. **1. Why Optic Neuritis is correct:** The clinical presentation of reduced visual acuity and loss of color vision (dyschromatopsia) is a hallmark of optic nerve dysfunction. In the context of Rheumatoid Arthritis (RA), optic neuritis can occur via two mechanisms: * **Autoimmune association:** RA is a systemic inflammatory disease that can directly cause inflammatory demyelination or vasculitis of the optic nerve. * **Drug-induced:** While the question mentions Diclofenac, it is a common "distractor" or a hint toward chronic management. However, patients with RA are frequently prescribed **Hydroxychloroquine (HCQ)** or **Ethambutol** (if associated with TB). While HCQ typically causes maculopathy, certain NSAIDs and systemic inflammatory states in RA are known triggers for optic neuropathy/neuritis. The loss of color vision specifically points toward the optic nerve rather than a simple refractive or lenticular issue. **2. Why incorrect options are wrong:** * **Open-angle glaucoma:** Usually presents with a slow, painless, peripheral visual field loss (arcuate scotomas). Acute loss of color vision is not an early feature. * **Angle-closure glaucoma:** Presents with sudden, severe ocular pain, redness, halos around lights, and a stony-hard eye. The painless nature and specific color vision loss in this vignette do not fit. * **Senile cataract:** Causes a gradual, painless blurring of vision. While it can affect color perception (yellowing), it does not cause the acute/subacute "loss" of color vision associated with nerve pathology. **Clinical Pearls for NEET-PG:** * **Color Vision:** Often the first clinical sign to deteriorate in optic nerve compression or inflammation, even before visual acuity drops significantly. * **RA Ocular triad:** The most common ocular manifestation of RA is **Keratoconjunctivitis Sicca (Dry Eye)**. The most specific/serious is **Scleritis** (specifically Scleromalacia Perforans). * **Marcus Gunn Pupil:** Always look for a Relative Afferent Pupillary Defect (RAPD) in suspected Optic Neuritis cases.

Question 146: Koeppe nodules are located at which anatomical structure?

A. Base of the Iris
B. Pupillary border of the Iris (Correct Answer)
C. Pars plana
D. Pars plicata

Explanation: **Explanation:** Koeppe nodules are a hallmark clinical sign of **granulomatous uveitis** (e.g., Sarcoidosis, Tuberculosis, Leprosy). These are small, translucent, or white-to-grey cellular aggregates composed of epithelioid cells and lymphocytes. * **Why Option B is correct:** Koeppe nodules are specifically located at the **pupillary margin** (border) of the iris. They are often the site where posterior synechiae (adhesions between the iris and lens) begin to form. * **Why Option A is incorrect:** Nodules located at the **base (periphery) of the iris** or within the iris stroma are known as **Busacca nodules**. These are less common than Koeppe nodules and are also indicative of granulomatous inflammation. * **Why Options C & D are incorrect:** The Pars plana and Pars plicata are components of the **ciliary body**. While these structures are involved in intermediate uveitis (e.g., "snowbanking" in pars planitis), they do not harbor Koeppe nodules, which are strictly iris manifestations. **High-Yield Clinical Pearls for NEET-PG:** 1. **Koeppe vs. Busacca:** Remember **K**oeppe = **K**orner (Pupillary margin); **B**usacca = **B**ody (Iris stroma/periphery). 2. **Granulomatous Uveitis Triad:** Large "Mutton-fat" Keratic Precipitates (KPs), Koeppe/Busacca nodules, and Iris pearls (specific to Leprosy). 3. **Berlin’s Nodules:** These are similar nodules found in the angle of the anterior chamber, visible only on gonioscopy. 4. **Lisch Nodules:** Do not confuse these with inflammatory nodules; Lisch nodules are melanocytic hamartomas found in **Neurofibromatosis Type 1**.

Question 147: Lisch Nodules are seen in which of the following conditions?

A. Neurofibromatosis Type 1 (Correct Answer)
B. Sturge-Weber syndrome
C. Tuberous sclerosis
D. Von Hippel-Lindau syndrome

Explanation: **Explanation:** **Lisch nodules** are the most common ocular manifestation of **Neurofibromatosis Type 1 (NF-1)**, also known as von Recklinghausen disease. They are melanocytic hamartomas of the iris, appearing as well-defined, dome-shaped, light brown to yellow elevations on the iris surface. They are highly diagnostic, present in over 95% of affected individuals by age 20, and are one of the official NIH diagnostic criteria for NF-1. **Analysis of Incorrect Options:** * **Sturge-Weber Syndrome:** Characterized by a "Port-wine stain" (nevus flammeus) and leptomeningeal angiomas. Ocular hallmarks include **buphthalmos** (congenital glaucoma) and diffuse choroidal hemangiomas ("tomato ketchup" fundus). * **Tuberous Sclerosis:** Classic ocular finding is the **astrocytic hamartoma** of the retina (mulberry lesions). It is associated with the Vogt triad: adenoma sebaceum, mental retardation, and epilepsy. * **Von Hippel-Lindau (VHL) Syndrome:** Characterized by **retinal capillary hemangioblastomas**, which appear as reddish globular masses with dilated, tortuous feeder vessels. **Clinical Pearls for NEET-PG:** * **NF-1 vs. NF-2:** Lisch nodules are specific to NF-1; they are **absent** in NF-2. NF-2 is instead associated with **PSC (Posterior Subcapsular Cataract)**. * **Optic Nerve Glioma:** This is the most common orbital tumor associated with NF-1. * **Sphenoid Wing Dysplasia:** A skeletal manifestation of NF-1 that can cause pulsating exophthalmos. * **Iris Mammillations:** Often confused with Lisch nodules, these are tiny, regular projections on the iris surface seen in ocular melanocytosis, not NF-1.

Question 148: Which of the following ocular findings is NOT typically associated with the listed diseases?

A. Galactosemia
B. Diabetes Mellitus
C. Phenylketonuria (Correct Answer)
D. Wilson disease

Explanation: **Explanation:** The correct answer is **Phenylketonuria (PKU)**. PKU is an autosomal recessive deficiency of phenylalanine hydroxylase, leading to high levels of phenylalanine. Its primary ocular manifestation is **hypopigmentation** (blue eyes/pale iris) due to decreased melanin synthesis. It is **not** typically associated with structural lens changes or specific pathognomonic ocular lesions like the other options listed. **Analysis of Options:** * **Galactosemia:** Classically associated with **"Oil droplet cataracts."** This occurs due to the accumulation of dulcitol (galactitol) in the lens, which exerts an osmotic effect, leading to lens opacification. * **Diabetes Mellitus:** A major cause of ocular morbidity. Key findings include **"Snowflake cataracts"** (true diabetic cataract), premature senile cataracts, and **Diabetic Retinopathy** (microaneurysms, hard exudates, and neovascularization). * **Wilson Disease:** Characterized by a deficiency in ceruloplasmin, leading to copper deposition. The pathognomonic sign is the **Kayser-Fleischer (KF) ring** (copper deposition in Descemet’s membrane) and **"Sunflower cataracts"** (copper deposition in the anterior lens capsule). **High-Yield Clinical Pearls for NEET-PG:** 1. **Cataract Morphology:** * Galactosemia $\rightarrow$ Oil droplet. * Diabetes $\rightarrow$ Snowflake. * Wilson Disease $\rightarrow$ Sunflower. * Myotonic Dystrophy $\rightarrow$ Christmas tree. * Hypocalcemia $\rightarrow$ Punctate/Zonular. 2. **KF Ring:** It is found in 95% of patients with neurological Wilson disease but may be absent in those with only hepatic involvement. 3. **PKU:** Remember the triad of **Intellectual disability, Musty/Mousy body odor, and Fair skin/Blue eyes.**

Question 149: Cotton wool spots are commonly seen in all of the following conditions EXCEPT?

A. HIV
B. Diabetes Mellitus
C. Hypertension
D. Cytomegalovirus retinitis (Correct Answer)

Explanation: **Explanation:** **Cotton wool spots (CWS)**, also known as soft exudates, are not true exudates. They represent areas of **focal retinal ischemia** in the nerve fiber layer (NFL). Ischemia leads to the obstruction of axoplasmic flow, causing a buildup of transported material (axoplasmic stasis) in the axons, which clinically appears as white, fluffy patches with indistinct margins. **Why CMV Retinitis is the Correct Answer:** Cytomegalovirus (CMV) retinitis is a **necrotizing viral infection** of the retina. It is characterized by full-thickness retinal necrosis, hemorrhage, and vasculitis (often described as a "pizza-pie" or "cheese and ketchup" appearance). While CWS are common in HIV patients (as part of HIV retinopathy), they are **not** a feature of CMV retinitis itself, which involves active destruction of tissue rather than simple focal ischemia of the NFL. **Analysis of Incorrect Options:** * **HIV:** HIV retinopathy is the most common ocular manifestation of AIDS, and **CWS are its hallmark feature**, occurring due to immune complex deposition and microvascular changes. * **Diabetes Mellitus:** CWS are a classic feature of **Pre-Proliferative Diabetic Retinopathy (PPDR)**, signifying worsening retinal ischemia. * **Hypertension:** CWS are seen in **Grade III Modified Scheie’s/Keith-Wagener-Barker classification** of Hypertensive Retinopathy, indicating acute arteriolar damage. **Clinical Pearls for NEET-PG:** * **Histology:** On microscopic examination, CWS correspond to **Cytoid bodies** (swollen axonal ends) in the nerve fiber layer. * **Differential Diagnosis:** Other causes of CWS include Systemic Lupus Erythematosus (SLE), severe anemia, leukemia, and retinal vein occlusions. * **CMV Retinitis:** Usually occurs when the **CD4 count drops below 50 cells/mm³**. Treatment of choice is Intravenous/Intravitreal Ganciclovir or Valganciclovir.

Question 150: Which is the most common early feature of diabetic retinopathy?

A. Dot and blot hemorrhages (Correct Answer)
B. Oedema
C. Hard exudates
D. Neovascularization

Explanation: **Explanation:** Diabetic Retinopathy (DR) is a microangiopathy affecting the retinal precapillary arterioles, capillaries, and venules. The earliest clinical signs are a result of increased capillary permeability and microvascular occlusion. **Why Dot and Blot Hemorrhages are the correct answer:** While **microaneurysms** are technically the very first clinical sign of DR, they are often grouped with or followed immediately by **dot and blot hemorrhages**. These hemorrhages occur due to the rupture of microaneurysms or weakened capillary walls in the deeper layers of the retina (Inner Nuclear and Outer Plexiform layers). Because the cells in these layers are arranged vertically, the blood is contained in a "dot" or "blot" shape. In many standard textbooks and NEET-PG patterns, dot and blot hemorrhages are recognized as the hallmark early feature of Non-Proliferative Diabetic Retinopathy (NPDR). **Why the other options are incorrect:** * **B. Oedema:** Macular oedema is the most common cause of **vision loss** in NPDR, but it typically develops after the initial vascular changes like microaneurysms and hemorrhages. * **C. Hard exudates:** These are composed of lipoproteins and lipid-laden macrophages. They occur due to chronic leakage from damaged vessels and usually appear after the initial hemorrhagic phase. * **D. Neovascularization:** This is the hallmark of **Proliferative Diabetic Retinopathy (PDR)**. It is a late-stage complication triggered by widespread retinal ischemia and the release of VEGF. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Clinical Sign:** Microaneurysms (found in the Inner Nuclear Layer). * **Most Common Cause of Legal Blindness in DM:** Diabetic Macular Oedema (DME). * **Cotton Wool Spots:** Represent focal retinal ischemia (infarction of the Nerve Fiber Layer). * **Classification Tip:** The presence of neovascularization (NVD/NVE) is the dividing line between NPDR and PDR.

Practice by Chapter

Diabetes Mellitus

Practice Questions

Hypertension

Practice Questions

Autoimmune Disorders

Practice Questions

Thyroid Disease

Practice Questions

HIV and AIDS

Practice Questions

Hematological Disorders

Practice Questions

Neurological Disorders

Practice Questions

Dermatological Conditions

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Pregnancy-Related Eye Changes

Practice Questions

Metabolic Disorders

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Ocular Toxicity of Systemic Medications

Practice Questions

Infectious Systemic Diseases

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