Rheumatology and Immunology — MCQs

Rheumatology and Immunology Indian Medical PG Practice Questions and MCQs

Question 821: A 30-year-old male presents with back pain and morning stiffness. An X-ray of the lumbar spine shows a bamboo spine appearance. What is the most likely diagnosis?

A. Osteoarthritis
B. Ankylosing spondylitis (Correct Answer)
C. Degenerative disc disease
D. Spinal stenosis

Explanation: ***Ankylosing spondylitis*** - The combination of **back pain**, **morning stiffness** in a young male, and especially the characteristic **bamboo spine appearance** on X-ray, is pathognomonic for ankylosing spondylitis. - The bamboo spine results from calcification of the **annulus fibrosus** and vertebral ligaments, leading to fusion of vertebral bodies. *Osteoarthritis* - This condition typically affects older individuals and presents with pain that **worsens with activity** and improves with rest, unlike the morning stiffness seen here. - X-rays in osteoarthritis show **osteophytes**, joint space narrowing, and subchondral sclerosis, not the diffuse spinal fusion of bamboo spine. *Degenerative disc disease* - Common in older adults, it involves the **deterioration of intervertebral discs**, leading to pain that can be exacerbated by movement. - While disc space narrowing and osteophyte formation can be seen, it does not typically result in the widespread **fusion** characteristic of a bamboo spine. *Spinal stenosis* - This is a narrowing of the spinal canal, often caused by **degenerative changes**, disc herniation, or thickened ligaments. - Symptoms include **neurogenic claudication** (leg pain that worsens with walking and improves with sitting), and X-rays show features of central canal narrowing rather than diffuse vertebral fusion.

Question 822: A 50-year-old woman with rheumatoid arthritis presents with fever, cough, and dyspnea. A chest X-ray shows bilateral interstitial infiltrates. What is the most likely diagnosis?

A. Interstitial lung disease
B. Pneumonia (Correct Answer)
C. Congestive heart failure
D. Pulmonary embolism

Explanation: **Pneumonia** - The presence of **fever, cough, and dyspnea** in a patient suggests an infectious process, which is highly consistent with pneumonia [1]. - **Bilateral interstitial infiltrates** on chest X-ray can be seen in various types of pneumonia, including viral or atypical pneumonias [3]. *Interstitial lung disease* - While rheumatoid arthritis can be associated with **interstitial lung disease (ILD)**, the acute onset of **fever, cough, and dyspnea** points more towards an acute process like infection rather than a subacute or chronic ILD flare [4]. - Though ILD can present with dyspnea and cough, fever would be less prominent unless there's an superimposed infection [2]. *Congestive heart failure* - **Congestive heart failure (CHF)** typically presents with progressive dyspnea, orthopnea, and peripheral edema, and chest X-ray findings often include **cardiomegaly**, **pleural effusions**, and **pulmonary vascular congestion**. [1] - **Fever** is not a typical symptom of uncomplicated CHF. *Pulmonary embolism* - A **pulmonary embolism (PE)** presents with acute dyspnea, pleuritic chest pain, and sometimes cough and tachycardia [2]. - Chest X-ray in PE is often normal or shows non-specific findings like atelectasis or small pleural effusions, not typically **bilateral interstitial infiltrates**.

Question 823: A 50-year-old woman with a history of dry eyes and mouth presents with bilateral parotid gland swelling. Which autoantibody is most specific for her condition?

A. ANA
B. RF
C. Anti-Ro/SSA
D. Anti-La/SSB (Correct Answer)

Explanation: ***Anti-La/SSB*** - While both **anti-Ro/SSA** and **anti-La/SSB** are characteristic of Sjögren's syndrome, **anti-La/SSB** is considered more specific. - The combination of **dry eyes (xerophthalmia)** and **dry mouth (xerostomia)**, along with parotid gland swelling, strongly indicates Sjögren's syndrome. *Anti-Ro/SSA* - **Anti-Ro/SSA** antibodies are frequently found in Sjögren's syndrome, but also in other autoimmune diseases like **systemic lupus erythematosus (SLE)**, making them less specific [1]. - A positive anti-Ro/SSA can also be associated with **neonatal lupus** and **subacute cutaneous lupus erythematosus** [1]. *ANA* - **Antinuclear antibodies (ANA)** are a common finding in many autoimmune diseases, including Sjögren's syndrome, but they are not specific for this condition [1]. - A positive ANA simply indicates the presence of an autoimmune process and requires further specific antibody testing [1]. *RF* - **Rheumatoid factor (RF)** is primarily associated with **rheumatoid arthritis** and can also be found in other autoimmune diseases or even healthy individuals. - It is not specific for Sjögren's syndrome, though it may be positive in some patients with Sjögren's (secondary Sjögren's associated with RA).

Question 824: A 40-year-old woman with rheumatoid arthritis presents with eye pain and redness. Examination reveals scleritis. What is the most likely associated systemic complication?

A. Interstitial lung disease (Correct Answer)
B. Cardiomyopathy
C. Renal failure
D. Peripheral neuropathy

Explanation: ***Interstitial lung disease*** - **Scleritis** in a patient with **rheumatoid arthritis** often indicates a more severe, systemic form of the disease. - **Interstitial lung disease (ILD)** is a common and serious **extra-articular manifestation** of rheumatoid arthritis, associated with higher disease activity and worse prognosis. *Cardiomyopathy* - While cardiac involvement can occur in RA (e.g., pericarditis, myocarditis), **cardiomyopathy** is less directly correlated with scleritis as a linked severe systemic complication. - **Rheumatoid arthritis** can increase the risk of cardiovascular disease due to accelerated atherosclerosis and systemic inflammation, but cardiomyopathy itself is not typically the direct systemic complication associated with scleritis. *Renal failure* - **Renal involvement** in rheumatoid arthritis is uncommon, usually related to complications from treatment (e.g., NSAID-induced nephropathy) or secondary amyloidosis, not directly with scleritis. - Scleritis itself does not directly predispose to **renal failure** as a primary systemic complication of RA. *Peripheral neuropathy* - **Peripheral neuropathy** can be a complication of rheumatoid arthritis, particularly in severe cases or vasculitis. - However, it is not as strongly or directly linked to the presence of **scleritis** as **interstitial lung disease** is, in terms of signifying systemic disease severity.

Question 825: Which joint disorder is characterized by early morning stiffness that improves with activity?

A. Rheumatoid arthritis (Correct Answer)
B. Osteoarthritis
C. Gout
D. Ankylosing spondylitis

Explanation: ***Rheumatoid arthritis*** - Patients with **rheumatoid arthritis** typically experience significant **morning stiffness** lasting more than 30 minutes, which tends to improve with movement and activity throughout the day [1], [2]. - This pattern is a key diagnostic feature indicating **inflammatory arthritis** [2]. *Osteoarthritis* - Morning stiffness in **osteoarthritis** is generally brief, lasting less than 30 minutes, and is often described as a "gelling phenomenon" that improves quickly with movement. - Pain in osteoarthritis typically worsens with activity and weight-bearing, unlike the improvement seen in rheumatoid arthritis. *Gout* - **Gout** is characterized by sudden, severe attacks of pain, usually in a single joint (**monoarticular**), often the big toe, peaking within hours rather than presenting as widespread morning stiffness. - The pain is excruciating and associated with redness, swelling, and warmth, not a gradual improvement with activity. *Ankylosing spondylitis* - While **ankylosing spondylitis** does present with morning stiffness that improves with activity, it primarily affects the **axial skeleton** (spine and sacroiliac joints). - The question describes a more generalized "joint disorder" implying peripheral joint involvement, which is characteristic of rheumatoid arthritis.

Question 826: A patient presents with a painful red eye and is diagnosed with scleritis. Which systemic condition is most commonly associated with scleritis?

A. Rheumatoid arthritis (Correct Answer)
B. Diabetes mellitus
C. Hypertension
D. Chronic kidney disease

Explanation: ***Rheumatoid arthritis*** - Scleritis is an inflammation of the **sclera**, the tough outer white layer of the eye, and is frequently associated with **systemic autoimmune diseases**. [1] - **Rheumatoid arthritis** is the most common systemic disease linked to scleritis, with up to half of all cases of scleritis presenting in patients with underlying systemic conditions. [1] *Diabetes mellitus* - While diabetes can affect the eyes, leading to **diabetic retinopathy** or cataracts, it is not commonly associated with scleritis. - Ocular manifestations of diabetes typically involve microvascular complications rather than inflammation of the sclera. *Hypertension* - Hypertension can lead to various ocular complications, such as **hypertensive retinopathy**, causing damage to the retinal blood vessels. - However, there is no direct or common association between hypertension and the development of scleritis. *Chronic kidney disease* - Chronic kidney disease can cause ocular changes like **uremic red eye** or band keratopathy due to calcium deposits, but it is not a primary cause of scleritis. - Its ophthalmic manifestations are generally distinct from inflammatory conditions like scleritis.

Question 827: A 40-year-old man presents with severe pain and redness in his right great toe after a night of heavy drinking. Synovial fluid analysis shows negatively birefringent crystals. What is the most likely diagnosis?

A. Rheumatoid arthritis
B. Pseudogout
C. Septic arthritis
D. Gout (Correct Answer)

Explanation: ***Gout*** - The sudden onset of **severe pain** and **redness** in the **great toe (podagra)**, especially after a night of **heavy drinking**, is highly characteristic of an acute gout attack [2]. - The finding of **negatively birefringent crystals** (uric acid crystals) in the synovial fluid is the **gold standard for diagnosing gout** [1]. *Rheumatoid arthritis* - This condition typically affects **multiple small joints symmetrically**, particularly of the hands and feet, rather than a single joint like the great toe in an acute, isolated episode. - Synovial fluid in rheumatoid arthritis would show **inflammatory changes** but not negatively birefringent crystals. *Pseudogout* - Pseudogout, caused by **calcium pyrophosphate dihydrate (CPPD) crystals**, often presents acutely with inflammation, but these crystals would be **positively birefringent** in synovial fluid analysis [1]. - While it can affect the great toe, it more commonly involves larger joints like the **knee** [3]. *Septic arthritis* - Although septic arthritis can cause acute, severe pain and redness in a single joint, synovial fluid analysis would reveal a **high white blood cell count** with a predominance of **neutrophils** and a **positive Gram stain/culture** for bacteria, not crystals. - A definitive diagnosis would require culturing the synovial fluid.

Question 828: A 55-year-old female presents with progressive skin tightening, difficulty swallowing, and dry eyes. Which of the following tests would be most supportive of a diagnosis of systemic sclerosis?

A. ANA titer and pattern results
B. Presence of anti-RNP antibodies
C. Presence of anti-centromere antibodies
D. Presence of anti-Scl-70 antibodies (Correct Answer)

Explanation: Presence of anti-Scl-70 antibodies - **Anti-Scl-70 antibodies** (topoisomerase I) are highly specific for **diffuse systemic sclerosis** and correlate with more severe disease, including lung fibrosis and skin involvement. - The patient's symptoms of **progressive skin tightening** and **difficulty swallowing** are characteristic of systemic sclerosis, making this antibody a strong indicator [1]. *ANA titer and pattern results* - While a **positive ANA** is almost universally present in systemic sclerosis, it is **not specific** enough for diagnosis on its own, as it can be positive in many other autoimmune conditions [1]. - The **pattern** (e.g., nucleolar or speckled) may suggest systemic sclerosis, but additional specific antibodies are needed for confirmation. *Presence of anti-RNP antibodies* - **Anti-RNP antibodies** are primarily associated with **mixed connective tissue disease (MCTD)**, which shares features of systemic sclerosis, lupus, and polymyositis [1]. - While some scleroderma patients may have positive anti-RNP, it's not the most definitive marker for systemic sclerosis specifically. *Presence of anti-centromere antibodies* - **Anti-centromere antibodies** are highly specific for **limited cutaneous systemic sclerosis (CREST syndrome)**, which typically presents with less extensive skin involvement and a more benign course than diffuse systemic sclerosis. - The patient's **progressive skin tightening** suggests a more diffuse form rather than limited.

Question 829: A 50-year-old woman presents with a malar rash, arthritis, and proteinuria. Which autoantibody is most specific for her condition?

A. Anti-Ro
B. Anti-centromere
C. Anti-dsDNA
D. Anti-Smith (Correct Answer)

Explanation: ***Anti-Smith*** - **Anti-Smith antibodies** are highly specific for **Systemic Lupus Erythematosus (SLE)**, reflecting the diagnosis suggested by the patient's symptoms (malar rash, arthritis, proteinuria) [1]. - While not as sensitive as ANA, their presence is almost diagnostic for SLE, especially in conjunction with the characteristic **renal involvement (proteinuria)** [1]. *Anti-dsDNA* - **Anti-dsDNA antibodies** are also highly specific for **SLE** and are often associated with **lupus nephritis**, but they are not considered *more* specific than anti-Smith antibodies for diagnosis overall [2]. - The level of anti-dsDNA antibodies can fluctuate with disease activity, making them useful for monitoring, but anti-Smith is considered the most specific for establishing the diagnosis [1]. *Anti-Ro* - **Anti-Ro antibodies** (also known as antibodies to **SS-A**) are commonly associated with **Sjögren's syndrome** and **subacute cutaneous lupus erythematosus**, as well as neonatal lupus [1], [3]. - While they can be found in SLE, they are not specific enough to diagnose the condition suggested by the patient's combination of symptoms. *Anti-centromere* - **Anti-centromere antibodies** are highly specific for the **limited cutaneous form of systemic sclerosis (CREST syndrome)**. - This antibody is not typically associated with the common manifestations of SLE presented by the patient, such as a malar rash or proteinuria.

Question 830: A 57-year-old man presents with bilateral hand joint pain and stiffness for the past six months. His hands appear swollen and red. Which of the following tests is the most specific for the suspected diagnosis?

A. ANA
B. RF
C. Anti-CCP (Correct Answer)
D. ESR

Explanation: ***Anti-CCP*** - **Anti-cyclic citrullinated peptide (anti-CCP)** antibodies are highly specific for **rheumatoid arthritis (RA)**, even in its early stages. - The presentation of bilateral hand joint pain and stiffness with swelling and redness is classic for RA, making anti-CCP the most useful test for confirmation [1]. *ANA* - **Antinuclear antibodies (ANA)** are associated with various **autoimmune diseases**, notably systemic lupus erythematosus, making it non-specific for rheumatoid arthritis alone. - While ANA can be positive in a subset of RA patients, its presence does not specifically point to RA over other autoimmune conditions. *RF* - **Rheumatoid factor (RF)** is positive in about 80% of RA patients but can also be positive in other conditions such as chronic infections, other autoimmune diseases (e.g., Sjögren's syndrome), and even in healthy individuals, especially the elderly, making it less specific than anti-CCP [1]. - Although useful for diagnosis and prognosis, its lower specificity means it alone cannot definitively confirm rheumatoid arthritis. *ESR* - **Erythrocyte sedimentation rate (ESR)** is a general marker of **inflammation** and elevated in many inflammatory conditions, including infections, malignancies, and various autoimmune diseases. - While often elevated in rheumatoid arthritis, it is not specific to the disease and only indicates general inflammation [1].

Practice by Chapter

Rheumatoid Arthritis

Practice Questions

Spondyloarthropathies

Practice Questions

Systemic Lupus Erythematosus

Practice Questions

Vasculitis Syndromes

Practice Questions

Scleroderma and Related Disorders

Practice Questions

Inflammatory Myopathies

Practice Questions

Crystal Arthropathies

Practice Questions

Osteoarthritis

Practice Questions

Primary Immunodeficiency Disorders

Practice Questions

Autoinflammatory Syndromes

Practice Questions

Sjögren's Syndrome

Practice Questions

Antiphospholipid Syndrome

Practice Questions

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