1. Clinical BCQ Challenge — SYSTEMIC VASCULITIS — MULTISYSTEM CLINICAL ASSESSMENT

MS Module — Clinical Long & Short Cases | Final Year MBBS

FINAL YEAR MBBS • KMU CURRICULUM • AIM CLINICAL LEARNING

📝 Clinical BCQ Challenge

SYSTEMIC VASCULITIS — MULTISYSTEM CLINICAL ASSESSMENT

20 A-Type Single Best Answer BCQs • Long Case Clinical Application

🎯 Purpose of This Clinical Challenge

Apply the knowledge gained from this Long Case to realistic Final Year clinical problems involving history, examination findings, diagnostic reasoning, investigation interpretation, diagnosis, management and complications.

🧠 How to Approach the BCQs

Clinical Clues Interpretation Diagnosis Investigations Management

Read each scenario carefully, identify the important clinical information and select the single best answer.

AIM CLINICAL ASSESSMENT

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Long Case • Clinical Reasoning • Single Best Answer

Welcome to your ❤️ LONG CASE 5 — Systemic Vasculitis — Multisystem Clinical Assessment 1.

A 46-year-old man presents with three months of fatigue, weight loss, recurrent nasal crusting and occasional blood-stained nasal discharge. He has received several antibiotic courses for presumed sinusitis. He now reports cough, dark-coloured urine and weakness of his right foot. Which aspect of his history most strongly indicates that his symptoms represent a systemic inflammatory disorder rather than an isolated ENT infection?

Persistence of nasal obstruction despite antibiotics

Development of renal and neurological symptoms alongside respiratory complaints

History of intermittent low-grade fever and reduced appetite

Progressive constitutional symptoms over three months

Occasional blood-stained nasal discharge with facial discomfort

None

A patient with suspected systemic vasculitis reports tea-coloured urine for two weeks. He has no dysuria, renal colic or visible edema. Examination reveals a blood pressure of 148/92 mmHg. Which additional clinical finding would most strongly support active glomerular involvement requiring urgent investigation?

Intermittent nocturia without urinary discomfort

Mild suprapubic discomfort after micturition

Increased urinary frequency with normal output

Progressive reduction in urine output with worsening hypertension

Occasional painless urination during the night

None

A 46-year-old schoolteacher has persistent sinonasal inflammation, pulmonary symptoms and suspected glomerulonephritis. During history-taking, he reports that his right foot has become progressively weak and numb. Which feature would most strongly support vasculitic peripheral nerve involvement rather than generalized muscle weakness?

Asymmetric weakness with sensory loss in a peripheral nerve distribution

Symmetrical proximal weakness without sensory abnormalities

Generalized fatigue with preserved muscle power

Bilateral muscle discomfort following physical exertion

Gradually increasing stiffness with brisk tendon reflexes

None

A patient with suspected systemic vasculitis develops multiple reddish-purple lesions over both lower legs. Examination reveals that the lesions are slightly raised, non-blanching and associated with systemic inflammatory symptoms. What is the most appropriate interpretation of these findings?

Cutaneous manifestations of chronic venous insufficiency

Platelet-mediated bleeding without vascular inflammation

Superficial skin infection involving dermal vessels

Cholesterol embolization affecting peripheral circulation

Inflammation involving small dermal blood vessels

None

A 46-year-old man with persistent nasal crusting and pulmonary nodules is found to have elevated blood pressure and impaired renal function. Examination reveals no peripheral edema, renal angle tenderness or signs of heart failure. Which interpretation is most appropriate?

Absence of edema excludes significant glomerular disease

Renal involvement is unlikely without loin tenderness

Significant glomerulonephritis may occur without overt edema

Hypertension indicates isolated essential hypertension

Renal abnormalities are secondary to pulmonary infection

None

A patient with suspected systemic vasculitis has reduced right ankle dorsiflexion to MRC grade 3/5 and diminished sensation over the dorsum of the foot. Higher mental functions are normal, and no upper motor neuron signs are present. Which clinical interpretation is most appropriate?

A central motor pathway lesion causing spastic weakness

An asymmetric peripheral neuropathy potentially associated with vasculitis

A generalized inflammatory myopathy affecting proximal muscles

A symmetrical length-dependent polyneuropathy

A primary motor neuron disorder affecting both lower limbs

None

A 46-year-old man has weight loss, persistent nasal crusting, pulmonary nodules, hematuria and palpable purpura. Investigations demonstrate elevated inflammatory markers and impaired renal function. Which diagnosis best explains the combined clinical findings?

Microscopic polyangiitis

Polyarteritis nodosa

Systemic lupus erythematosus

Granulomatosis with polyangiitis

Isolated pulmonary tuberculosis

None

A patient presents with constitutional symptoms, palpable purpura, hypertension and peripheral neuropathy. The physician considers polyarteritis nodosa and granulomatosis with polyangiitis. Which additional finding would most strongly favor granulomatosis with polyangiitis over polyarteritis nodosa?

Red cell casts indicating glomerulonephritis

Persistent constitutional symptoms with weight loss

Asymmetric peripheral neurological deficits

Elevated inflammatory markers during active illness

Cutaneous purpuric lesions over the lower limbs

None

A 46-year-old man has cough, occasional hemoptysis, weight loss and multiple pulmonary nodules, some showing cavitation. Further assessment reveals chronic nasal inflammation, hematuria and PR3-ANCA positivity. Which diagnostic interpretation is most appropriate?

Pulmonary imaging alone confirms granulomatous vasculitis

PR3-ANCA positivity establishes the diagnosis independently

Pulmonary tuberculosis is excluded by positive autoimmune serology

Renal abnormalities are unrelated to the pulmonary presentation

The combined clinical pattern supports GPA, but infection and other mimics require exclusion

None

10.

A 46-year-old man with suspected granulomatosis with polyangiitis has a serum creatinine of 2.1 mg/dL, urine dipstick blood 3+ and protein 2+. Microscopy demonstrates numerous erythrocytes and red cell casts. Which interpretation best explains this laboratory pattern?

Lower urinary tract bleeding secondary to mucosal inflammation

Isolated renal tubular damage without glomerular involvement

Active glomerular inflammation associated with systemic vasculitis

Renal impairment caused primarily by urinary tract obstruction

Transient hematuria resulting from a recent respiratory infection

None

11.

A patient with suspected granulomatosis with polyangiitis has persistent nasal disease, cavitating pulmonary nodules, elevated inflammatory markers and active urinary sediment. PR3-ANCA testing is positive. Which conclusion regarding this result is most appropriate?

It confirms the diagnosis without further clinical evaluation

It supports GPA in the appropriate clinical context but is not independently diagnostic

It excludes microscopic polyangiitis in every clinical setting

It confirms the absence of concurrent pulmonary infection

It establishes the degree of renal tissue damage without biopsy

None

12.

A 46-year-old man with suspected systemic small-vessel vasculitis develops worsening renal function. Urinalysis reveals proteinuria, hematuria and red cell casts. Renal biopsy demonstrates pauci-immune necrotizing crescentic glomerulonephritis. What is the most appropriate interpretation?

Immune-complex deposition characteristic of lupus nephritis

Chronic hypertensive nephrosclerosis without active inflammation

Primary renal tubular injury caused by systemic infection

ANCA-associated glomerular injury with potentially rapid renal deterioration

Isolated proteinuria caused by a non-inflammatory renal disorder

None

13.

A patient with suspected granulomatosis with polyangiitis has constitutional symptoms, pulmonary nodules and declining kidney function. His ESR is 78 mm/hour and CRP is elevated. The treating team is considering immunosuppressive therapy. Which additional diagnostic step is most important before treatment when clinically feasible?

Evaluate for relevant infections, particularly pulmonary tuberculosis

Repeat ESR until it returns to the reference range

Assess serum cholesterol before confirming vasculitis

Delay further investigations until pulmonary nodules resolve

Repeat ANCA testing to demonstrate increasing antibody titres

None

14.

A 46-year-old man with granulomatosis with polyangiitis has biopsy-supported glomerulonephritis, creatinine 2.1 mg/dL and pulmonary nodules. He is clinically stable but has significant organ involvement. Which management approach is most appropriate?

Oral analgesics with observation until constitutional symptoms resolve

Antibiotic therapy alone for presumed recurrent sinus infection

Low-dose glucocorticoid monotherapy without specialist review

Symptomatic treatment with repeat renal investigations after several months

Urgent specialist-directed remission induction with glucocorticoids and rituximab or cyclophosphamide

None

15.

A patient undergoing treatment planning for organ-threatening granulomatosis with polyangiitis is being considered for cyclophosphamide-based induction therapy. He is concerned about treatment-related complications and future fertility. Which clinical approach is most appropriate?

Reassure him that cyclophosphamide has no significant reproductive effects

Begin treatment without discussing adverse effects because disease control is urgent

Discuss infection risk, potential gonadal toxicity and appropriate monitoring before treatment

Recommend stopping all immunosuppression whenever mild fatigue occurs

Explain that routine laboratory monitoring is unnecessary after treatment initiation

None

16.

A patient with granulomatosis with polyangiitis begins remission-induction treatment. After several weeks, his constitutional symptoms improve, but the treating physician must assess whether renal disease is responding. Which monitoring approach provides the most clinically useful information?

Repeat PR3-ANCA titres alone to determine remission

Monitor renal function, urinary sediment, proteinuria and clinical status

Assess nasal symptoms alone as a marker of systemic improvement

Repeat chest imaging without reviewing renal investigations

Monitor ESR alone without reassessing organ function

None

17.

A patient with granulomatosis with polyangiitis has achieved clinical remission following induction therapy. His renal function has stabilized, and pulmonary symptoms have improved. Which long-term management strategy is most appropriate?

Discontinue all treatment immediately after symptomatic improvement

Continue high-dose induction treatment indefinitely without reassessment

Replace immunosuppressive treatment with analgesics alone

Initiate an appropriate maintenance regimen with regular relapse and toxicity monitoring

Arrange follow-up only if severe pulmonary symptoms recur

None

18.

A 46-year-old man with known granulomatosis with polyangiitis develops rapidly increasing breathlessness and cough with fresh blood. Oxygen saturation has fallen to 86% on room air, and examination reveals widespread pulmonary crackles. Which complication should be considered most urgently?

Diffuse alveolar hemorrhage causing acute respiratory compromise

Chronic stable pulmonary nodules without active inflammation

Mild recurrent upper respiratory tract inflammation

Isolated pleural irritation without pulmonary involvement

Chronic pulmonary fibrosis without acute deterioration

None

19.

A patient with ANCA-associated vasculitis has initially stable renal function during treatment. At follow-up, his serum creatinine rises substantially, urine output decreases and blood pressure increases. Urinalysis continues to show red cell casts. Which is the most appropriate immediate clinical decision?

Attribute the deterioration to normal fluctuations in renal function

Continue routine outpatient observation without changing the plan

Stop monitoring renal function because ANCA positivity is already established

Treat the urinary findings as uncomplicated lower urinary tract infection

Arrange urgent evaluation for active, potentially rapidly progressive glomerulonephritis

None

20.

A 46-year-old man with granulomatosis with polyangiitis has completed remission-induction treatment and is receiving maintenance immunosuppression. He feels well and asks whether follow-up visits and urine tests are still necessary. Which counselling advice is most appropriate?

Regular monitoring is necessary only if nasal symptoms recur

Normalization of ANCA titres eliminates the possibility of relapse

Ongoing clinical and laboratory follow-up is required to detect relapse and treatment toxicity

Renal surveillance can be discontinued once respiratory symptoms improve

Maintenance treatment may be stopped independently when symptoms disappear

None

Time's up

💡 AIM Clinical Learning Tip

Do not answer from isolated recall alone. Think through the patient: clinical finding → interpretation → diagnosis → investigation → clinical decision.

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