Rheumatology and Immunology Practice Questions

Q: Anti-alpha fodrin autoantibodies are seen in which of the following conditions?

Sjogren's syndrome. **Explanation:** **Sjogren’s Syndrome (SS)** is a chronic autoimmune disorder characterized by lymphocytic infiltration of exocrine glands. While **Anti-Ro (SS-A)** and **Anti-La (SS-B)** are the classic serological markers, **Anti-alpha fodrin antibodies** have emerged as highly specific markers for the condition [1]. Alpha-fodrin is a 240 kDa cytoskeleton protein (organ-specific autoantigen) found in the salivary and lacrimal glands. During apoptosis of these glandular cells, alpha-fodrin is cleaved, triggering an autoimmune response. These antibodies are particularly useful in diagnosing "seronegative" Sjogren’s patients who test negative for Ro/La. **Analysis of Incorrect Options:** * **Polymyositis:** Characterized by antibodies against aminoacyl-tRNA synthetases, most notably **Anti-Jo-1** [1]. * **Crohn’s Disease:** Associated with **ASCA** (Anti-Saccharomyces cerevisiae antibodies) and occasionally p-ANCA. * **Graves’ Disease:** Driven by **TSHR-Ab** (Thyroid Stimulating Hormone Receptor Antibodies/TSI). **NEET-PG High-Yield Pearls:** * **Most Specific Marker for SS:** Anti-Ro (SS-A) and Anti-La (SS-B) remain the gold standard in criteria, but Anti-alpha fodrin is a specific adjunct. * **Schirmer’s Test:** Used to quantify lacrimal gland hypofunction (<5mm in 5 mins is positive). * **Lip Biopsy:** The most definitive diagnostic test, showing focal lymphocytic sialadenitis (Focus score ≥1). * **Malignancy Risk:** Patients with Sjogren’s have a 40-fold increased risk of developing **B-cell Non-Hodgkin Lymphoma** (MALToma).

Q: A 52-year-old female presents with dysphagia, heartburn, and joint pain in her fingers. She reports her fingers and toes turn blue upon exposure to cold. Physical examination reveals thickened skin of her fingers and tender, painful small lumps under the skin of the flexor surface of her hands, some of which drain a white, chalky substance. What is the clinical diagnosis?

CREST syndrome. **Explanation:** The patient presents with the classic pentad of **CREST syndrome**, a limited form of systemic sclerosis. The diagnosis is established by identifying the following clinical features: * **C**alcinosis cutis: The "white, chalky substance" draining from lumps on the flexor surfaces is calcium hydroxyapatite [2]. * **R**aynaud’s phenomenon: Fingers turning blue upon cold exposure. * **E**sophageal dysmotility: Manifesting as dysphagia and heartburn (due to lower esophageal sphincter incompetence). * **S**clerodactyly: Thickened skin of the fingers [1]. * **T**elangiectasia: (Though not explicitly mentioned, the other four features confirm the diagnosis). **Why other options are incorrect:** * **Systemic Lupus Erythematosus (SLE):** While SLE presents with joint pain and Raynaud’s, it typically features a malar rash, photosensitivity, and renal involvement, rather than calcinosis or esophageal dysmotility. * **Sjogren Syndrome:** Characterized primarily by sicca symptoms (dry eyes/mouth). While it can coexist with scleroderma, it does not explain the chalky skin deposits or skin thickening. * **Mikulicz Syndrome:** This is a historical term for bilateral enlargement of the lacrimal and salivary glands (often associated with IgG4-related disease or Sjogren’s), which does not match this patient's systemic presentation. **High-Yield Clinical Pearls for NEET-PG:** * **Antibody Association:** CREST syndrome is strongly associated with **Anti-centromere antibodies** (highly specific). Diffuse systemic sclerosis is associated with **Anti-Scl-70 (topoisomerase I)**. * **Pulmonary Complication:** The most common cause of death in CREST is **Pulmonary Arterial Hypertension (PAH)**, whereas in diffuse scleroderma, it is Interstitial Lung Disease (ILD) [2]. * **Treatment:** Raynaud’s is managed with Calcium Channel Blockers (e.g., Nifedipine). ACE inhibitors are life-saving for Scleroderma Renal Crisis [2].

Q: Which of the following is the most frequent presenting symptom in patients with giant cell arteritis?

Headache. **Explanation:** **Giant Cell Arteritis (GCA)**, also known as temporal arteritis, is a large-vessel vasculitis that primarily affects individuals over the age of 50 [3]. **1. Why Headache is the correct answer:** **Headache** is the most common presenting symptom, occurring in approximately **two-thirds (60–90%)** of patients. It is typically new-onset, localized to the temporal or occipital regions, and may be associated with scalp tenderness (e.g., pain while combing hair) [1]. The underlying mechanism is the granulomatous inflammation of the branches of the external carotid artery. **2. Analysis of Incorrect Options:** * **B. Jaw claudication:** While this is the **most specific** symptom for GCA (highest positive likelihood ratio), it occurs in only about 50% of patients, making it less frequent than headache. * **C. Polymyalgia rheumatica (PMR):** PMR (proximal muscle pain and stiffness) is closely associated with GCA; about 40–50% of GCA patients have concurrent PMR [2]. However, it is a co-morbidity or associated syndrome rather than the primary presenting symptom of the vasculitis itself. * **D. Blindness:** Permanent visual loss (due to anterior ischemic optic neuropathy) is the most dreaded complication, but with modern diagnostic awareness, it occurs in only about 15–20% of patients [2]. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Temporal artery biopsy (look for "skip lesions") [2]. * **Best Initial Test:** ESR (usually >50 mm/hr, often >100 mm/hr) and CRP [2]. * **Treatment:** Immediate high-dose corticosteroids (Prednisone) to prevent blindness; do not wait for biopsy results if clinical suspicion is high [2]. * **Key Association:** Strongly linked with the **HLA-DR4** haplotype.

Q: A 20-year-old male presents with a 2-week history of knee joint pain. He also reports mild backache and stiffness. Four weeks prior to these complaints, he experienced fever and diarrhea. The patient is currently afebrile and has no diarrhea. His laboratory investigations reveal normal ESR and elevated CRP. What is the most probable diagnosis?

Reactive arthritis. The clinical presentation is classic for **Reactive Arthritis (ReA)**, a member of the Spondyloarthritides (SpA) group. [3] **Why Reactive Arthritis is correct:** Reactive arthritis is an asymmetric inflammatory oligoarthritis that typically follows 1–4 weeks after a gastrointestinal (e.g., *Salmonella, Shigella, Campylobacter*) or urogenital (e.g., *Chlamydia*) infection. [2] This patient’s timeline (diarrhea 4 weeks prior followed by knee pain and back stiffness) fits perfectly. [3] It typically affects young adults and involves large weight-bearing joints (knees/ankles) and the axial skeleton (backache). [3] Elevated CRP is a common marker of acute inflammation, even if ESR is normal. **Why other options are incorrect:** * **Ankylosing Spondylitis:** While it causes backache, it is a chronic, progressive disease characterized by sacroiliitis. [1] It does not typically follow an acute diarrheal episode. * **Rheumatoid Arthritis:** Usually presents as a symmetric, small-joint polyarthritis (PIP, MCP) and is not preceded by an enteric infection. * **Enteropathic Arthritis:** This is arthritis associated with active Inflammatory Bowel Disease (Crohn’s or Ulcerative Colitis). This patient had a transient episode of fever and diarrhea (suggestive of infectious enteritis), not chronic IBD. **NEET-PG High-Yield Pearls:** * **Reiter’s Syndrome Triad:** Arthritis, Urethritis, and Conjunctivitis ("Can't see, can't pee, can't climb a tree"). [3] * **HLA-B27:** Strongly associated (up to 80% of cases). [2] * **Extra-articular features:** Keratoderma blennorrhagicum (skin lesions on palms/soles) and Circinate balanitis. [3] * **Treatment:** NSAIDs are the first-line therapy; antibiotics do not treat the arthritis once it has started.

Q: A 35-year-old woman presents with a red rash over her cheeks and pain and swelling in both knees and several small joints in her hands. She has a history of hypertension and was started on a new medication for blood pressure control two months ago. Her ANA and anti-histone antibodies are positive. Which of the following medications is most likely to have caused her condition?

hydralazine. ### Explanation **Correct Option: A. Hydralazine** The clinical presentation describes **Drug-Induced Lupus Erythematosus (DILE)**. The patient exhibits classic symptoms of systemic lupus (malar rash, polyarthritis) following the initiation of a new antihypertensive [1]. The presence of **anti-histone antibodies** is the hallmark serological marker for DILE, occurring in >95% of cases. Hydralazine is one of the most common drugs associated with this condition, especially in "slow acetylators" (individuals who metabolize the drug slowly via the N-acetyltransferase enzyme). **Incorrect Options:** * **B. Hydrochlorothiazide:** While thiazides can cause photosensitivity or trigger subacute cutaneous lupus erythematosus (SCLE), they are not typically associated with the classic anti-histone positive DILE syndrome [2]. * **C. Ramipril:** ACE inhibitors are not recognized causes of drug-induced lupus. Their common side effects include cough and angioedema [2]. * **D. Nifedipine:** Calcium channel blockers are not associated with DILE. **High-Yield Clinical Pearls for NEET-PG:** * **Common Culprits (SHIPP):** **S**ulfonamides, **H**ydralazine, **I**soniazid, **P**henytoin, **P**rocainamide (Procainamide has the highest risk; Hydralazine is the most common in clinical practice). * **Serology:** Anti-histone antibodies are positive in DILE, but **Anti-dsDNA is usually negative** (unlike idiopathic SLE) [3]. Complement levels (C3, C4) are typically normal [3]. * **Clinical Features:** DILE usually presents with pleuropericarditis, fever, and arthralgia. Notably, **renal and CNS involvement are rare** compared to idiopathic SLE. * **Management:** Symptoms typically resolve within weeks after discontinuing the offending drug.

Q: Which joint is rarely affected by ankylosing spondylitis?

Ankle. **Explanation:** Ankylosing Spondylitis (AS) is a chronic inflammatory seronegative spondyloarthropathy that primarily targets the axial skeleton and large proximal joints. **Why Ankle is the Correct Answer:** In AS, peripheral joint involvement typically follows a **centripetal pattern**, meaning it predominantly affects the "root" joints (proximal joints) like the hips and shoulders. Distal joints, such as the **ankle**, wrist, and small joints of the hands and feet, are **rarely involved**. When peripheral involvement does occur in the lower limbs, it more commonly manifests as enthesitis (e.g., Achilles tendonitis or plantar fasciitis) rather than true joint synovitis. **Analysis of Incorrect Options:** * **Sacroiliac Joint:** This is the **hallmark** of AS. Symmetrical sacroiliitis is usually the earliest radiographic finding and is essential for diagnosis according to the Modified New York Criteria. * **Hip Joint:** The hip is the most commonly involved extra-axial joint (up to 30-50% of cases). Hip involvement is often bilateral and is a major predictor of functional disability and the need for future surgery. * **Shoulder Joint:** Along with the hip, the shoulder is a "root" joint frequently affected in AS, leading to a significant reduction in the range of motion (the "proximal" pattern). **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign:** Symmetrical Sacroiliitis. * **Genetic Association:** HLA-B27 (found in >90% of white patients). * **Radiological Signs:** "Bamboo spine" (due to marginal syndesmophytes), Dagger sign, and Andersson lesion. * **Schober’s Test:** Used to clinically assess the restriction of lumbar spine flexion. * **Extra-articular Manifestation:** Acute anterior uveitis is the most common.

Q: Which antibody is associated with neonatal lupus and conduction abnormalities in the heart?

Anti-Ro antibody. **Explanation:** **Anti-Ro (SS-A) antibodies** are the primary markers associated with **Neonatal Lupus Erythematosus (NLE)** [1]. These IgG antibodies cross the placenta from the mother to the fetus. While they cause transient cutaneous rashes, their most serious complication is permanent damage to the fetal cardiac conduction system, specifically the AV node, leading to **congenital third-degree (complete) heart block** [1]. * **Why Anti-Ro is correct:** Anti-Ro antibodies (specifically the 52-kDa component) bind to fetal cardiac tissue, leading to inflammation and subsequent fibrosis of the AV node. This is a classic high-yield association for neonatal bradycardia. * **Why Anti-La (SS-B) is incorrect:** While Anti-La is often found alongside Anti-Ro in NLE and Sjögren’s syndrome [1], Anti-Ro is more strongly and independently linked to the development of congenital heart block. * **Why Anti-nuclear antibody (ANA) is incorrect:** ANA is a highly sensitive but non-specific screening marker for various autoimmune diseases. It does not specifically pinpoint the risk for neonatal cardiac conduction defects. * **Why Anti-Histone antibody is incorrect:** This is the hallmark antibody for **Drug-Induced Lupus (DIL)** (e.g., caused by Hydralazine, Procainamide, or Isoniazid) and is not associated with neonatal lupus. **High-Yield Clinical Pearls for NEET-PG:** * **Congenital Heart Block:** Unlike the skin rash of NLE, which resolves as maternal antibodies wane (approx. 6 months), the heart block is **irreversible** and often requires a permanent pacemaker. * **Maternal Status:** The mother may be asymptomatic or have diagnosed SLE/Sjögren’s syndrome at the time of delivery. * **Screening:** Pregnant women with known Anti-Ro antibodies require serial fetal echocardiography (weekly/bi-weekly) between 16–26 weeks of gestation to monitor for PR interval prolongation.

Q: Heerfordt's syndrome consists of fever, parotid enlargement, facial palsy, and which of the following?

Anterior uveitis. **Explanation:** **Heerfordt’s Syndrome** (also known as Uveoparotid Fever) is a rare, specific clinical manifestation of **Sarcoidosis**. It is characterized by a classic tetrad of clinical features: 1. **Fever** 2. **Parotid enlargement** (usually bilateral and painless) 3. **Facial nerve palsy** (lower motor neuron type; can be unilateral or bilateral) [1] 4. **Anterior uveitis** (the correct answer) The underlying medical concept is a granulomatous infiltration of the cranial nerves and exocrine glands. Anterior uveitis in this syndrome is typically chronic and granulomatous, often presenting with "mutton-fat" keratic precipitates. **Analysis of Incorrect Options:** * **Option A (Arthralgia):** While common in systemic sarcoidosis, it is not a defining component of the Heerfordt tetrad [1]. * **Option B (Bilateral hilar lymphadenopathy):** This is the hallmark radiological finding of sarcoidosis (Stage I), but it is not part of the specific clinical constellation of Heerfordt’s syndrome [1]. * **Option C (Erythema nodosum):** This is a component of **Löfgren’s syndrome** (which consists of Erythema nodosum, Bilateral hilar lymphadenopathy, and Polyarthritis/Arthralgia), another high-yield variant of sarcoidosis [1]. **Clinical Pearls for NEET-PG:** * **Löfgren’s Syndrome vs. Heerfordt’s Syndrome:** Remember Löfgren’s is associated with a *good prognosis* and acute onset, while Heerfordt’s is a more chronic presentation [1]. * **Neurological involvement:** Facial nerve palsy is the most common cranial nerve involvement in Neurosarcoidosis [1]. * **Diagnosis:** Diagnosis of Heerfordt’s is clinical, but definitive sarcoidosis diagnosis requires biopsy showing **non-caseating granulomas**. * **Treatment:** Systemic corticosteroids are the mainstay of management for symptomatic Heerfordt’s syndrome.

Q: Which of the following is not a recognized risk factor for systemic sclerosis?

Miners exposed to lead. Systemic Sclerosis (SSc) is a complex autoimmune disease characterized by vascular dysfunction and progressive fibrosis [1]. Its pathogenesis involves a combination of genetic susceptibility and environmental triggers. **Why Option C is the Correct Answer:** While environmental exposure to certain minerals is a well-documented risk factor for SSc, the specific association is with **Silica (Silicon dioxide)**, not lead. Miners (especially coal and gold miners), stonecutters, and sandblasters exposed to silica dust have a significantly higher risk of developing SSc (Erasmus Syndrome). There is currently no established clinical evidence linking **lead exposure** to the pathogenesis of systemic sclerosis. **Analysis of Incorrect Options:** * **Options A & B (HCMV and Parvovirus B19):** Viral infections are implicated in triggering SSc through "molecular mimicry." Human Cytomegalovirus (HCMV) can induce antibodies that cross-react with endothelial cells and U3-RNP, while Parvovirus B19 has been detected in the skin and bone marrow of SSc patients, potentially driving the inflammatory cascade. * **Option D (Bleomycin):** This is a classic pharmacological trigger. Bleomycin-induced lung and skin fibrosis is a recognized side effect that closely mimics the fibrotic phase of SSc by stimulating fibroblast activity [1]. Other drugs include pentazocine and cocaine. **High-Yield Clinical Pearls for NEET-PG:** * **Erasmus Syndrome:** The specific association of silicosis with systemic sclerosis. * **Toxic Oil Syndrome:** Historically linked to denatured rapeseed oil, causing SSc-like symptoms. * **Vinyl Chloride:** Exposure in plastics industry workers is a high-yield environmental trigger for scleroderma-like skin changes and Raynaud’s. * **Autoantibody Marker:** Anti-Scl-70 (topoisomerase I) is specific for diffuse cutaneous SSc, while Anti-centromere is specific for limited cutaneous SSc (CREST).

Question 1

Anti-alpha fodrin autoantibodies are seen in which of the following conditions?

Accepted Answer

Sjogren's syndrome

Answer

Polymyositis

Answer

Crohn's disease

Answer

Graves' disease

Question 2

A 52-year-old female presents with dysphagia, heartburn, and joint pain in her fingers. She reports her fingers and toes turn blue upon exposure to cold. Physical examination reveals thickened skin of her fingers and tender, painful small lumps under the skin of the flexor surface of her hands, some of which drain a white, chalky substance. What is the clinical diagnosis?

Accepted Answer

CREST syndrome

Answer

Systemic lupus erythematosus

Answer

Sjogren Syndrome

Answer

Mikulicz syndrome

Question 3

Which of the following is more frequently seen in Churg Strauss Syndrome compared to Wegener's Granulomatosis?

Accepted Answer

Lower Respiratory Tract involvement

Answer

Renal involvement

Answer

Eye involvement

Answer

Upper Respiratory Tract involvement

Question 4

Which of the following is the most frequent presenting symptom in patients with giant cell arteritis?

Accepted Answer

Headache

Answer

Jaw claudication

Answer

Polymyalgia rheumatica

Answer

Blindness

Question 5

A 20-year-old male presents with a 2-week history of knee joint pain. He also reports mild backache and stiffness. Four weeks prior to these complaints, he experienced fever and diarrhea. The patient is currently afebrile and has no diarrhea. His laboratory investigations reveal normal ESR and elevated CRP. What is the most probable diagnosis?

Accepted Answer

Reactive arthritis

Answer

Ankylosing spondylitis

Answer

Rheumatoid arthritis

Answer

Enteropathic arthritis

Question 6

A 35-year-old woman presents with a red rash over her cheeks and pain and swelling in both knees and several small joints in her hands. She has a history of hypertension and was started on a new medication for blood pressure control two months ago. Her ANA and anti-histone antibodies are positive. Which of the following medications is most likely to have caused her condition?

Accepted Answer

hydralazine

Answer

hydrochlorothiazide

Answer

ramipril

Answer

nifedipine

Question 7

Which joint is rarely affected by ankylosing spondylitis?

Accepted Answer

Ankle

Answer

Hip

Answer

Shoulder

Answer

Sacroiliac

Question 8

Which antibody is associated with neonatal lupus and conduction abnormalities in the heart?

Accepted Answer

Anti-Ro antibody

Answer

Anti-nuclear antibody

Answer

Anti-La antibody

Answer

Anti-Histone antibody

Question 9

Heerfordt's syndrome consists of fever, parotid enlargement, facial palsy, and which of the following?

Accepted Answer

Anterior uveitis

Answer

Arthralgia

Answer

Bilateral hilar lymphadenopathy

Answer

Erythema nodosum

Question 10

Which of the following is not a recognized risk factor for systemic sclerosis?

Accepted Answer

Miners exposed to lead

Answer

Human cytomegalovirus infection

Answer

Human parvovirus B19 infection

Answer

Drugs such as bleomycin

Rheumatology and Immunology — MCQs

Rheumatology and Immunology — MCQs

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