Rheumatology and Immunology Practice Questions

Q: Needle-shaped crystals that are negatively birefringent on polarized microscopy are characteristic of which crystal-associated arthropathy?

Gout. **Explanation:** The identification of synovial fluid crystals under polarized light microscopy is the gold standard for diagnosing crystal-associated arthropathies [1]. **1. Why Gout is Correct:** Gout is caused by the deposition of **Monosodium Urate (MSU)** crystals in the joints [1]. Under compensated polarized light microscopy, MSU crystals exhibit two classic characteristics: * **Morphology:** They are **needle-shaped**. * **Birefringence:** they show **strong negative birefringence**. This means they appear **yellow** when aligned parallel to the slow axis of the compensator and blue when perpendicular. **2. Why the other options are incorrect:** * **CPPD (Pseudogout):** These crystals are typically **rhomboid or rod-shaped** and exhibit **weak positive birefringence** (appearing blue when parallel to the compensator) [1]. * **Neuropathic (Charcot) Arthropathy:** This is a progressive joint destruction due to loss of sensation (commonly in Diabetes) [2]. Diagnosis is clinical and radiological (6 D’s: Destruction, Debris, Disorganization, etc.), not based on specific crystals. * **Hemophilic Arthropathy:** This results from recurrent intra-articular bleeding (hemartherosis) leading to synovial hypertrophy and cartilage damage. Synovial fluid would show RBCs or hemosiderin, not needle-shaped crystals. **High-Yield Clinical Pearls for NEET-PG:** * **Initial Drug of Choice (Acute Gout):** NSAIDs (e.g., Indomethacin). Colchicine is an alternative [2]. * **Gold Standard for Chronic Management:** Allopurinol (Xanthine oxidase inhibitor) [3]. * **Radiology:** Look for "punched-out" erosions with overhanging edges (**Martel’s sign**). * **Polarized Light Rule:** **Y**ellow = **P**arallel in Gout (**Y-P**). If it’s Yellow when Parallel, it is Negatively Birefringent.

Q: What is the main clinical feature of primary antiphospholipid syndrome?

Thrombosis. Explanation: Antiphospholipid Syndrome (APS) is an autoimmune hypercoagulable state characterized by the presence of antiphospholipid antibodies (aPL) such as Lupus Anticoagulant, Anti-cardiolipin, and Anti-β2-glycoprotein I. Why Thrombosis is the Correct Answer: The hallmark of APS is recurrent arterial or venous thrombosis and/or pregnancy complications (e.g., recurrent miscarriages). The antibodies induce a prothrombotic state by activating endothelial cells, platelets, and monocytes, leading to the inappropriate formation of blood clots. This occurs in the absence of significant inflammation of the vessel wall, distinguishing it from vasculitis. Analysis of Incorrect Options: * Vascular Injury: While vascular injury can trigger clotting, APS is primarily a humoral immune-mediated thrombotic disorder rather than a direct mechanical or inflammatory injury to the vessel. * Trauma: Trauma is a physical cause of clotting and bleeding; APS is an endogenous autoimmune pathology. * Bleeding Disorder: This is a common distractor. Although the Lupus Anticoagulant (LA) prolongs the *in vitro* Activated Partial Thromboplastin Time (aPTT), it paradoxically causes thrombosis, not bleeding, *in vivo*. High-Yield Clinical Pearls for NEET-PG: * Primary vs. Secondary: Primary APS occurs in isolation, while Secondary APS is most commonly associated with Systemic Lupus Erythematosus (SLE) [1]. * Livedo Reticularis: A common cutaneous manifestation (lace-like purplish discoloration). * Catastrophic APS (Asherson’s Syndrome): A rare, life-threatening form involving multiorgan failure due to small-vessel occlusion. * Diagnosis: Requires at least one clinical criteria (thrombosis or pregnancy loss) and one laboratory criteria (positive aPL tests 12 weeks apart).

Q: A 74-year-old man presents with a history of increasing frequency of headaches, fatigue, and weight loss for 3 months. He has had migraine headaches in the past, but these are different from them. He is also experiencing back, shoulder, and hip discomfort, which is worse in the morning. His head and neck examination is normal. Range of motion in the shoulders and hips is reduced because of discomfort but there is no active inflammation. Which of the following signs or symptoms is most helpful in the diagnosis?

Pain in the jaw when chewing. This patient presents with a classic clinical triad suggestive of **Giant Cell Arteritis (GCA)**, also known as Temporal Arteritis: new-onset headache in an elderly patient, constitutional symptoms (weight loss, fatigue), and features of **Polymyalgia Rheumatica (PMR)** (proximal muscle stiffness in shoulders and hips) [1], [2]. ### 1. Why the Correct Answer is Right **Jaw Claudication (Pain in the jaw when chewing)** is the most specific clinical symptom for GCA. It occurs due to ischemia of the masseter and temporalis muscles resulting from vasculitis of the maxillary artery branches. While headaches and malaise are common, they are non-specific; jaw claudication significantly increases the likelihood of the diagnosis and indicates a higher risk of permanent visual loss due to ophthalmic artery involvement. ### 2. Why Incorrect Options are Wrong * **Throat pain (A):** While GCA can rarely involve the carotid arteries (leading to "carotidynia"), it is not a classic or diagnostic feature compared to jaw claudication. * **Malaise (C) and Fatigue (D):** These are constitutional symptoms found in almost all systemic inflammatory diseases, malignancies, and chronic infections. They lack the diagnostic specificity required to differentiate GCA from other conditions in an elderly patient. ### 3. High-Yield Clinical Pearls for NEET-PG * **Demographics:** Almost exclusively occurs in patients >50 years; strongly associated with HLA-DR4. * **PMR Association:** ~50% of GCA patients have PMR (proximal stiffness, elevated ESR, but normal Creatine Kinase) [2]. * **Gold Standard Diagnosis:** Temporal artery biopsy (look for "skip lesions"). * **Emergency Management:** If GCA is suspected, start **high-dose corticosteroids immediately** to prevent irreversible blindness (Amaurosis fugax/AION); do not wait for biopsy results. * **Lab Marker:** Characteristically very high ESR (often >100 mm/hr) [3].

Q: All of the following are seen in inflammatory polyarthritis, except?

New bone formation. **Explanation:** In rheumatology, the fundamental distinction lies between **inflammatory** (e.g., Rheumatoid Arthritis) and **non-inflammatory/degenerative** (e.g., Osteoarthritis) joint diseases. **1. Why "New bone formation" is the correct answer:** Inflammatory polyarthritis is characterized by synovial inflammation (synovitis) which leads to the release of pro-inflammatory cytokines (like TNF-α and IL-1) [1]. these cytokines stimulate **osteoclast** activity, leading to **bone erosions** and periarticular osteopenia rather than bone formation [1]. In contrast, **new bone formation** (osteophytes, subchondral sclerosis) is the hallmark of **degenerative/non-inflammatory** arthritis (Osteoarthritis). **2. Analysis of incorrect options:** * **Erythema:** This is one of the cardinal signs of inflammation (*rubor*). While less common in chronic RA, it is frequently seen in acute inflammatory states like gouty polyarthritis or septic arthritis. * **Increased ESR:** Inflammatory joint diseases are systemic [1]. Elevated acute-phase reactants (ESR and CRP) are standard laboratory markers reflecting the underlying systemic inflammatory process. * **Morning stiffness > 1 hour:** This is a classic diagnostic criterion for inflammatory arthritis [2]. In non-inflammatory conditions (OA), stiffness is typically brief (less than 30 minutes) and worsens with activity ("wear and tear"). **Clinical Pearls for NEET-PG:** * **Inflammatory Arthritis:** Better with activity, worse with rest, prolonged morning stiffness, systemic symptoms (fever, weight loss) [2]. * **Non-inflammatory Arthritis:** Worse with activity, better with rest, minimal morning stiffness, no systemic symptoms. * **Radiology Tip:** Look for "Joint space narrowing + Erosions" in RA, and "Joint space narrowing + Osteophytes" in OA.

Q: A 21-year-old woman presents with a 3-month history of malaise, joint pain, weight loss, and sporadic fever. The patient appears agitated. Her temperature is 38degC (101degF). Other physical findings include malar rash, erythematous pink plaques with telangiectatic vessels, oral ulcers, and non-blanching purpuric papules on her legs. Laboratory studies show elevated levels of blood urea nitrogen and creatinine. Antibodies directed to which of the following antigens would be expected in the serum of this patient?

Double-stranded DNA. **Explanation:** The clinical presentation is classic for **Systemic Lupus Erythematosus (SLE)**. The patient meets multiple ACR/EULAR criteria: constitutional symptoms (fever, weight loss), malar rash, oral ulcers, arthritis (joint pain), and neuropsychiatric involvement (agitation/psychosis) [1]. The elevated BUN and creatinine suggest **Lupus Nephritis**, and the purpuric papules indicate cutaneous vasculitis [1]. **1. Why Double-stranded DNA (dsDNA) is correct:** Anti-dsDNA antibodies are highly specific for SLE. In this patient, they are particularly relevant because their titers correlate with **disease activity** and the presence of **Lupus Nephritis** [2]. While Anti-Smith (Sm) is the most specific, Anti-dsDNA is the hallmark for monitoring renal involvement and flares [2]. **2. Why other options are incorrect:** * **A & C (C-ANCA & P-ANCA):** These are markers for Small Vessel Vasculitides. C-ANCA (PR3) is associated with Granulomatosis with Polyangiitis (GPA), while P-ANCA (MPO) is seen in Microscopic Polyangiitis and Eosinophilic Granulomatosis with Polyangiitis (EGPA). While SLE can cause vasculitis, it is not an ANCA-associated disease. * **D (Rheumatoid Factor):** Though RF can be positive in 20-30% of SLE cases, it is non-specific and primarily used for Rheumatoid Arthritis [1]. It does not explain the multisystem (renal/CNS) involvement as accurately as dsDNA. **Clinical Pearls for NEET-PG:** * **Most Sensitive Screen:** ANA (Anti-nuclear antibody) [2]. * **Most Specific Marker:** Anti-Smith (Sm) antibody [1]. * **Drug-Induced Lupus:** Anti-Histone antibodies (Hydralazine, Procainamide, Isoniazid). * **Neonatal Lupus/Sjogren’s:** Anti-Ro (SSA) and Anti-La (SSB) [1]. * **Complement levels (C3, C4):** These decrease during active SLE flares, especially in renal disease [2].

Q: Which of the following is associated with double-stranded DNA antibodies?

Systemic lupus erythematosus. ### Explanation **Systemic Lupus Erythematosus (SLE)** is the correct answer because anti-double-stranded DNA (anti-dsDNA) antibodies are highly specific for this condition [1]. While the Antinuclear Antibody (ANA) test is the best initial screening tool for SLE due to its high sensitivity, **anti-dsDNA** and **anti-Smith (anti-Sm)** antibodies are the "confirmatory" markers due to their high specificity (nearly 100%) [1]. Furthermore, anti-dsDNA levels correlate with disease activity, particularly the development of **lupus nephritis** [1]. **Analysis of Incorrect Options:** * **Juvenile Idiopathic Arthritis (JIA):** While ANA can be positive in JIA (especially in the oligoarticular subtype, where it predicts a higher risk of uveitis), anti-dsDNA is typically absent. * **Systemic Sclerosis (Scleroderma):** This condition is associated with **anti-Scl-70** (anti-topoisomerase I) in diffuse disease and **anti-centromere** antibodies in limited disease (CREST syndrome) [1]. * **Dermatomyositis:** This inflammatory myopathy is characterized by **anti-Jo-1** (associated with interstitial lung disease) and **anti-Mi-2** antibodies [1]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most Sensitive Test for SLE:** ANA (best for screening) [1]. 2. **Most Specific Tests for SLE:** Anti-dsDNA and Anti-Smith [1]. 3. **Prognostic Value:** Anti-dsDNA titers fluctuate with disease activity and are linked to renal involvement; Anti-Smith titers do not correlate with activity [1]. 4. **Drug-Induced Lupus:** Associated with **anti-histone antibodies**; anti-dsDNA is usually negative here. 5. **Neonatal Lupus/Sjögren’s:** Associated with **anti-Ro (SS-A)** and **anti-La (SS-B)** antibodies [1].

Q: A 23-year-old woman is diagnosed with SLE. Which of the following organ system complications is she most likely to have over the course of her lifetime?

Musculoskeletal. In Systemic Lupus Erythematosus (SLE), the **musculoskeletal system** is the most frequently involved organ system, affecting approximately **90% to 95%** of patients during their lifetime [1]. The most common manifestations include migratory, symmetrical, non-erosive inflammatory polyarthritis and arthralgia, typically involving the small joints of the hands and wrists. A characteristic finding is **Jaccoud’s arthropathy**, which presents as reducible deformities due to ligamentous laxity rather than bone destruction. **Analysis of Options:** * **B. Cutaneous:** While very common (affecting ~80% of patients), skin manifestations like the malar rash or photosensitivity are slightly less frequent than joint involvement [1]. * **C. Renal:** Lupus nephritis is a major cause of morbidity and mortality, occurring in about 50% of patients [1]. While clinically significant, it is not the most common manifestation. * **A. Cardiopulmonary:** Pleuritis and pericarditis are common, but they occur in roughly 50% of cases, making this system less frequently involved than the musculoskeletal system. **NEET-PG High-Yield Pearls:** * **Most common initial symptom:** Fatigue or Arthralgia. * **Most common organ system involved:** Musculoskeletal (>90%) [1]. * **Most common cause of death (Early):** Active disease or Infections. * **Most common cause of death (Late):** Cardiovascular disease (Accelerated Atherosclerosis). * **Most specific antibody:** Anti-dsDNA and Anti-Smith (Anti-Sm) [2]. * **Best screening test:** ANA (High sensitivity, low specificity) [2].

Q: HLA B27 is commonly associated with which of the following?

Ankylosing spondylitis. **Explanation:** **Ankylosing Spondylitis (AS)** is the correct answer because it is the prototypical **Seronegative Spondyloarthropathy (SpA)**. There is a profound genetic association between **HLA-B27** (a Class I MHC molecule) and AS; approximately **90-95%** of patients with AS are HLA-B27 positive [1]. While the exact pathogenesis is debated (theories include the "misfolded protein response" or "arthritogenic peptide hypothesis"), the presence of this allele significantly increases the risk of developing sacroiliitis and enthesitis [1]. **Analysis of Incorrect Options:** * **Rheumatic Fever:** This is an immunologically mediated post-streptococcal (Group A Streptococcus) sequela. It is associated with **HLA-DR4** and **DR7**, not HLA-B27. * **Rheumatoid Arthritis (RA):** RA is strongly associated with **HLA-DR4** (specifically the "shared epitope" on the DRB1 allele). It is characterized by symmetric small joint involvement and positive Rheumatoid Factor/anti-CCP. * **Osteoarthritis:** This is primarily a degenerative joint disease related to aging, mechanical stress, and metabolic factors, with no specific HLA-B27 association. **High-Yield Clinical Pearls for NEET-PG:** 1. **Mnemonic for HLA-B27 (PAIR):** **P**soriatic arthritis, **A**nkylosing spondylitis, **I**nflammatory bowel disease-associated arthritis, and **R**eactive arthritis [1]. 2. **Strongest Association:** Among all SpAs, the association is strongest with **Ankylosing Spondylitis**. 3. **Clinical Presentation:** Look for a young male with chronic low back pain, **morning stiffness** that improves with exercise, and "Bamboo spine" on X-ray [1]. 4. **Extra-articular manifestation:** The most common extra-articular feature of AS is **Acute Anterior Uveitis** [1].

Question 1

Needle-shaped crystals that are negatively birefringent on polarized microscopy are characteristic of which crystal-associated arthropathy?

Accepted Answer

Gout

Answer

Calcium pyrophosphate dihydrate (CPPD) deposition disease

Answer

Neuropathic arthropathy

Answer

Hemophilic arthropathy

Question 2

What is the main clinical feature of primary antiphospholipid syndrome?

Accepted Answer

Thrombosis

Answer

Vascular injury

Answer

Trauma

Answer

Bleeding disorder

Question 3

A 74-year-old man presents with a history of increasing frequency of headaches, fatigue, and weight loss for 3 months. He has had migraine headaches in the past, but these are different from them. He is also experiencing back, shoulder, and hip discomfort, which is worse in the morning. His head and neck examination is normal. Range of motion in the shoulders and hips is reduced because of discomfort but there is no active inflammation. Which of the following signs or symptoms is most helpful in the diagnosis?

Accepted Answer

Pain in the jaw when chewing

Answer

Throat pain on swallowing

Answer

Malaise

Answer

Fatigue

Question 4

Dermatomyositis associated with Anti-Mi2 antibodies shows strong association with which of the following clinical features?

Accepted Answer

Heliotrope rash

Answer

Mechanic hands

Answer

Butterfly rash

Answer

Discoid rash

Question 5

All of the following are seen in inflammatory polyarthritis, except?

Accepted Answer

New bone formation

Answer

Erythema

Answer

Increased ESR

Answer

Morning stiffness more than one hour

Question 6

A 21-year-old woman presents with a 3-month history of malaise, joint pain, weight loss, and sporadic fever. The patient appears agitated. Her temperature is 38degC (101degF). Other physical findings include malar rash, erythematous pink plaques with telangiectatic vessels, oral ulcers, and non-blanching purpuric papules on her legs. Laboratory studies show elevated levels of blood urea nitrogen and creatinine. Antibodies directed to which of the following antigens would be expected in the serum of this patient?

Accepted Answer

Double-stranded DNA

Answer

C-ANCA (anti-proteinase-3)

Answer

P-ANCA (anti-myeloperoxidase)

Answer

Rheumatoid factor

Question 7

Which of the following is associated with double-stranded DNA antibodies?

Accepted Answer

Systemic lupus erythematosus

Answer

Juvenile rheumatoid arthritis

Answer

Systemic sclerosis

Answer

Dermatomyositis

Question 8

A 23-year-old woman is diagnosed with SLE. Which of the following organ system complications is she most likely to have over the course of her lifetime?

Accepted Answer

Musculoskeletal

Answer

Cardiopulmonary

Answer

Cutaneous

Answer

Renal

Question 9

HLA B27 is commonly associated with which of the following?

Accepted Answer

Ankylosing spondylitis

Answer

Rheumatic fever

Answer

Rheumatoid arthritis

Answer

Osteoarthritis

Question 10

A 40-year-old woman presents with complaints of burning and tingling sensations in the left hand for several months. She relates that she has been frequently awakened at night by aching pain in the same hand. Pain is elicited by extreme dorsiflexion of the wrist. What is the most likely diagnosis?

Accepted Answer

Carpal tunnel syndrome

Answer

Angina pectoris

Answer

Dupuytren contracture

Answer

Fibrositis

Rheumatology and Immunology — MCQs

Rheumatology and Immunology — MCQs

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