Dermatological Conditions Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Dermatological Conditions. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Dermatological Conditions Indian Medical PG Question 1: Commonest complication of topical corticosteroids is -
- A. Ptosis
- B. Proptosis
- C. Glaucoma (Correct Answer)
- D. Cataract
Dermatological Conditions Explanation: ***Glaucoma***
- **Topical corticosteroids** are well-known to increase **intraocular pressure** by reducing the outflow of aqueous humor, leading to **steroid-induced glaucoma**.
- This complication can result in irreversible **optic nerve damage** and vision loss if not managed properly.
*Ptosis*
- **Ptosis** is a drooping of the upper eyelid and is not a common complication directly associated with topical corticosteroid use.
- It is more often linked to issues like **muscle weakness**, nerve damage, or age-related changes.
*Proptosis*
- **Proptosis** refers to the bulging of the eye and is typically associated with conditions like **Graves' ophthalmopathy** or orbital tumors.
- It is not a common or direct side effect of topical corticosteroid application.
*Cataract*
- While **steroid-induced cataracts** (specifically **posterior subcapsular cataracts**) are a known complication of chronic systemic corticosteroid use, they are less common with topical corticosteroids and usually require prolonged, high-dose therapy.
- In contrast, a rise in intraocular pressure (leading to glaucoma) can occur more acutely and with lower doses of topical corticosteroids.
Dermatological Conditions Indian Medical PG Question 2: A 25-year-old male presents with recurrent bilateral conjunctival hyperemia and a gritty sensation. Likely diagnosis?
- A. Vernal keratoconjunctivitis (Correct Answer)
- B. Herpes keratitis
- C. Episcleritis
- D. Bacterial conjunctivitis
Dermatological Conditions Explanation: ***Vernal keratoconjunctivitis***
* This is the correct diagnosis as it perfectly matches the clinical presentation: **young male patient** (VKC has male predominance, especially in adolescents/young adults), **recurrent course** (VKC is a chronic allergic condition with seasonal exacerbations), and **bilateral involvement** with gritty sensation.
* VKC is a **severe form of allergic conjunctivitis** characterized by **bilateral conjunctival hyperemia**, intense itching, gritty sensation, photophobia, and mucoid discharge. The recurrent bilateral nature in a young male is pathognomonic.
*Herpes keratitis*
* Usually presents as **unilateral eye pain**, redness, and a characteristic **dendritic ulcer** on the cornea (seen with fluorescein staining), which is not described here.
* Caused by herpes simplex virus and typically has an acute presentation rather than recurrent bilateral conjunctival symptoms. Can lead to significant vision loss if untreated.
*Episcleritis*
* Characterized by **localized sectorial redness** in one eye, often in a radial pattern, and is usually **mild and self-limiting**.
* Typically causes minimal discomfort and does not commonly present with gritty sensation or recurrent bilateral involvement as the primary feature.
*Bacterial conjunctivitis*
* Typically presents with **purulent discharge** (thick yellow-green pus) and matting of eyelids, which is not mentioned in this patient's symptoms.
* While it causes redness and grittiness, it's usually **acute and unilateral or sequential bilateral** (one eye then the other), and resolves with topical antibiotics within days, unlike the recurrent chronic nature described here.
Dermatological Conditions Indian Medical PG Question 3: Optic cup is derived from?
- A. Neural ectoderm (Correct Answer)
- B. Surface ectoderm
- C. Mesoderm
- D. Neural crest
Dermatological Conditions Explanation: ***Neural ectoderm***
- The **optic cup** develops from an outgrowth of the **forebrain**, which is neural ectoderm. [1]
- This structure forms the **retina** and the **posterior layers of the iris and ciliary body**.
*Surface ectoderm*
- The **surface ectoderm** gives rise to the **lens** and the **corneal epithelium**, not the optic cup itself. [1]
- It also forms structures like skin, hair, and nails.
*Mesoderm*
- **Mesoderm** differentiates into components such as the **sclera**, **choroid**, and **extrinsic ocular muscles**. [1]
- It does not directly form the neural structures of the eye like the optic cup.
*Neural crest*
- **Neural crest cells** contribute to structures like the **corneal endothelium** and **stroma**, parts of the **iris stroma**, and the **ciliary body stroma**.
- They are important for facial development but do not form the optic cup.
Dermatological Conditions Indian Medical PG Question 4: Unilateral frontal blisters with upper lid edema and conjunctivitis is seen in?
- A. Herpes Simplex
- B. Herpes Zoster Ophthalmicus (Correct Answer)
- C. Neuroparalytic Keratitis
- D. Acanthamoeba Keratitis
Dermatological Conditions Explanation: ***Herpes Zoster Ophthalmicus***
- This condition is characterized by a **unilateral vesicular rash** (blisters) in the **trigeminal dermatome (V1)**, which includes the forehead and upper eyelid, along with significant **lid edema** and **conjunctivitis**.
- **Hutchinson's sign** (lesions on the tip, side, or root of the nose) indicates a high risk of ocular involvement due to the nasociliary nerve innervation.
*Acanthamoeba Keratitis*
- This is an **amoebic infection** of the cornea typically associated with **contact lens wear** and often presents with severe pain and a **ring infiltrate** in the cornea.
- It does not typically present with unilateral frontal blisters or significant lid edema.
*Herpes Simplex*
- Herpes simplex typically causes **recurrent corneal ulcers** (dendritic or geographic) and sometimes blepharitis, but not the widespread **unilateral frontal blisters** seen in the trigeminal distribution.
- While it can cause conjunctivitis and lid edema, the pattern of skin lesions is the key differentiator.
*Neuroparalytic Keratitis*
- This condition results from **trigeminal nerve damage**, leading to corneal anesthesia and subsequent **trophic corneal ulceration**.
- It presents primarily with **corneal findings** (epithelial defects, ulcers) due to impaired sensation and tear film stability, not initial vesicular skin lesions or prominent lid edema.
Dermatological Conditions Indian Medical PG Question 5: A patient presents with a history of bullae involving more than 30% of the body surface area, along with rashes all over the body and erosions of the lips and other mucosa, for a few days. What could be the potential triggering factor for this condition?
- A. Viral infection
- B. Drug induced (Correct Answer)
- C. Bacterial infection
- D. Idiopathic
Dermatological Conditions Explanation: ***Correct: Drug induced***
- The severe presentation with widespread **bullae** covering over 30% of the body surface area, extensive rashes, and **mucosal erosions** (lips) is highly suggestive of **Toxic Epidermal Necrolysis (TEN)**.
- TEN is most commonly **drug-induced**, often triggered by medications like **antibiotics** (sulfonamides, penicillins), **anticonvulsants** (carbamazepine, phenytoin, lamotrigine), **NSAIDs**, and **allopurinol**.
- The combination of extensive skin detachment (>30% BSA), mucosal involvement, and acute onset strongly points to a drug-induced etiology.
*Incorrect: Viral infection*
- While some viral infections can cause rashes and mucocutaneous lesions, they typically do not lead to such widespread **epidermal detachment** and severe **mucosal erosions** affecting over 30% BSA, as seen in TEN.
- Viral exanthems (e.g., measles, herpes) are generally milder and have different morphology compared to the full-thickness epidermal necrosis seen in this condition.
*Incorrect: Bacterial infection*
- Bacterial skin infections can cause **bullous impetigo** or **staphylococcal scalded skin syndrome (SSSS)**, but SSSS typically spares the mucous membranes and involves superficial epidermal splitting (not full-thickness necrosis).
- The extent and severity of the lesions, including widespread **mucosal involvement**, are more consistent with a systemic hypersensitivity reaction rather than a localized or superficial bacterial infection.
*Incorrect: Idiopathic*
- Although the cause can sometimes be undetermined, the pattern of severe symptoms described—especially with extensive **skin sloughing** and **mucosal involvement**—points strongly to a known etiology.
- TEN has a well-established association with drug triggers in **80-95% of cases**, making a truly idiopathic cause unlikely in the absence of thorough drug history evaluation.
Dermatological Conditions Indian Medical PG Question 6: A 30-year-old with recurrent ulcers on lips and genitalia, and positive pathergy test. Diagnosis?
- A. Herpes simplex
- B. Behcet's disease (Correct Answer)
- C. Pemphigus vulgaris
- D. Syphilis
Dermatological Conditions Explanation: Behcet's disease
- The combination of recurrent oral and genital ulcers along with a positive pathergy test is highly characteristic of Behcet's disease.
- Behcet's is a systemic vasculitis that can affect multiple organ systems, with mucocutaneous lesions being a hallmark [3].
Herpes simplex
- While herpes simplex causes recurrent oral (cold sores) and genital ulcers, it does not typically involve a positive pathergy test [1].
- Herpes lesions are typically vesicular before ulcerating, and diagnosis is often confirmed by viral culture or PCR [1].
Pemphigus vulgaris
- Characterized by painful oral blisters and erosions, but genital ulcers are less common, and it does not typically involve a positive pathergy test.
- Pemphigus vulgaris is an autoimmune blistering disease due to antibodies against desmoglein, diagnosed by biopsy and immunofluorescence [2].
Syphilis
- Can cause oral and genital ulcers (chancres in primary syphilis) and sometimes mucocutaneous lesions in secondary syphilis (e.g., mucous patches).
- However, syphilis does not present with a positive pathergy test, and its diagnosis is made through serological tests (e.g., RPR, VDRL, FTA-ABS).
Dermatological Conditions Indian Medical PG Question 7: A patient with acute history of blistering and denudation involving >30% BSA along with erosions of the lips with hemorrhagic crusting and other mucosa for few days. What is the most common triggering factor?
- A. Drug induced (Correct Answer)
- B. Viral infection
- C. Idiopathic
- D. Bacterial infection
Dermatological Conditions Explanation: ***Drug induced***
- **Toxic epidermal necrolysis (TEN)**, characterized by blistering and denudation of >30% body surface area and mucosal involvement, is most commonly triggered by **drugs**, such as sulfonamides, antiepileptics, allopurinol, and NSAIDs.
- The rapid onset and severe presentation are highly suggestive of an adverse drug reaction.
*Viral infection*
- While viruses can trigger some mucocutaneous reactions, severe widespread necrosis and denudation like in TEN are not typically **direct viral effects**.
- **Herpes simplex virus (HSV)** can cause erythema multiforme, which is less severe and extensive than TEN.
*Idiopathic*
- While some cases of severe cutaneous adverse reactions can be idiopathic, the vast majority of **TEN cases have an identifiable trigger**, with drugs being the leading cause.
- Attributing it to an unknown cause would be less precise given the common association with medications.
*Bacterial infection*
- Bacterial infections, such as **Staphylococcal scalded skin syndrome (SSSS)**, can cause blistering and desquamation, but it primarily affects children and involves a superficial epidermal split, rather than the full-thickness necrosis seen in TEN.
- SSSS typically spares the **mucous membranes**, unlike the prominent mucosal involvement described in the patient.
Dermatological Conditions Indian Medical PG Question 8: Distichiasis is a condition characterized by:
- A. Abnormal inversion of eyelashes
- B. Abnormal extra row of cilia (Correct Answer)
- C. Abnormal eversion of eyelashes
- D. Misdirected cilia
Dermatological Conditions Explanation: ***Abnormal extra row of cilia***
- **Distichiasis** is a congenital or acquired condition characterized by the presence of a double row of eyelashes, where the extra row emerges from the **Meibomian gland orifices**.
- These accessory eyelashes can be the same length as normal lashes or appear finer and shorter, often causing **ocular irritation**, corneal abrasion, and epiphora due to their abnormal growth direction.
*Abnormal inversion of eyelashes*
- This description typically refers to **trichiasis**, where normally positioned eyelashes grow inwards towards the eye.
- While both can cause irritation, **trichiasis** involves misdirection of existing lashes, whereas distichiasis involves an *extra* row.
*Abnormal eversion of eyelashes*
- Eversion of eyelashes is not a recognized abnormality in this context; rather, **ectropion** refers to the outward turning of the eyelid margin, which may expose the eyelashes but is not a primary cilial abnormality.
- This condition is more about eyelid positioning than the eyelashes themselves.
*Misdirected cilia*
- While distichiasis does involve cilia growing in an abnormal direction, the key feature of distichiasis is the presence of an *additional* row of lashes, not just misdirection of the primary row.
- **Trichiasis** is the more appropriate term for misdirected cilia from the normal lash line.
Dermatological Conditions Indian Medical PG Question 9: Primary objective of the use of atropine in anterior uveitis
- A. Rest to the ciliary muscle (Correct Answer)
- B. Helps in preventing posterior synechia formation
- C. Increase blood flow
- D. Increase supply of antibody
Dermatological Conditions Explanation: ***Rest to the ciliary muscle***
- Atropine is a **cycloplegic** agent that paralyzes the **ciliary muscle**, thereby alleviating pain caused by spasms and inflammation in anterior uveitis.
- This **cycloplegia** is the primary therapeutic goal, as it reduces **ciliary spasm** and the associated pain.
*Helps in preventing posterior synechia formation (secondary effect)*
- While atropine's **mydriatic** action (pupil dilation) helps prevent the formation of **posterior synechiae**, this is a beneficial secondary effect and not its primary objective in alleviating symptoms or pain.
- The dilation breaks existing synechiae or prevents new ones from forming by moving the iris away from the lens capsule.
*Increase blood flow*
- Atropine's primary action is anticholinergic, leading to **cycloplegia** and **mydriasis**, not a direct increase in ocular blood flow.
- Increased blood flow is not a targeted therapeutic effect of atropine in acute anterior uveitis.
*Increase supply of antibody*
- Atropine does not directly influence the immune system or increase the supply of antibodies to the inflamed eye.
- Its mechanism of action is limited to blocking muscarinic acetylcholine receptors.
Dermatological Conditions Indian Medical PG Question 10: Which of the following indicates activity of anterior uveitis?
- A. Cells in anterior chamber (Correct Answer)
- B. Circumcorneal congestion
- C. Keratic precipitate
- D. Corneal edema
Dermatological Conditions Explanation: ***Cells in anterior chamber***
- The presence of **inflammatory cells** (leukocytes) floating in the **aqueous humor** is a direct sign of active inflammation in the anterior uvea.
- These cells cause the **Tyndall effect** (flare) when a slit lamp beam is passed through the anterior chamber, indicating active uveitis.
*Circumcorneal congestion*
- This is a symptom of **uveitis** but doesn't specifically indicate the *activity* of the inflammation. It's a general sign of inflammation in the anterior segment.
- It results from dilation of the **perilimbal blood vessels**, which can persist even when the inflammation is subsiding.
*Keratic precipitate*
- These are **deposits of inflammatory cells** on the posterior corneal surface. While seen in uveitis, they represent the *sequelae* of inflammation rather than active, ongoing cellular activity in the aqueous.
- They can be present even in quiescent phases of the disease, making them less indicative of current activity compared to live cells in the anterior chamber.
*Corneal edema*
- **Corneal edema** can occur in severe anterior uveitis but is not a primary indicator of active inflammation. It usually signifies compromise of the corneal endothelium due to prolonged or severe inflammation.
- It is a less direct measure of the ongoing inflammatory process than the presence of cellular activity in the anterior chamber.
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