A 52-year-old man from Delhi presents with a 6-month history of progressive dyspnea, dry cough, and chest tightness. High-resolution CT chest shows bilateral upper lobe predominant reticulonodular opacities with hilar lymphadenopathy. Serum ACE level is elevated at 68 U/L (normal

Question

A 52-year-old man from Delhi presents with a 6-month history of progressive dyspnea, dry cough, and chest tightness. High-resolution CT chest shows bilateral upper lobe predominant reticulonodular opacities with hilar lymphadenopathy. Serum ACE level is elevated at 68 U/L (normal <40). Chest X-ray shows Scadding stage II changes. What is the most appropriate next step in management?

Accepted Answer

B. Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA). ## Clinical Context: Suspected Sarcoidosis — Need for Tissue Diagnosis

The patient presents with features highly suggestive of pulmonary sarcoidosis:
- Bilateral upper lobe reticulonodular opacities with hilar lymphadenopathy
- Elevated serum ACE (68 U/L; normal <40)
- Scadding stage II (bilateral hilar lymphadenopathy + parenchymal infiltrates)

## Why EBUS-TBNA is the Most Appropriate Next Step?

**Key Point:** Sarcoidosis is a **diagnosis of exclusion** requiring histopathological confirmation of non-caseating granulomas before any treatment is initiated. Clinical features and elevated ACE are supportive but NOT diagnostic — tuberculosis, lymphoma, fungal infections, and other granulomatous diseases can mimic this presentation exactly.

**High-Yield (Harrison's Principles of Internal Medicine, 21st ed.):** The diagnostic workup of suspected sarcoidosis mandates tissue biopsy to demonstrate non-caseating granulomas and exclude other causes. EBUS-TBNA has a diagnostic yield of **>80%** for mediastinal/hilar lymphadenopathy in sarcoidosis and is the preferred minimally invasive approach per ATS/ERS/WASOG guidelines.

**Clinical Pearl:** In a patient from Delhi (high TB-endemic region), initiating corticosteroids without histological confirmation risks catastrophic dissemination of undiagnosed tuberculosis. Tissue diagnosis is therefore non-negotiable before treatment.

## Why Other Options Are Incorrect?

| Option | Reasoning |
|---|---|
| **A) Serum/urinary calcium** | Important safety screening, but comes AFTER diagnosis is confirmed — not the immediate next step before tissue biopsy |
| **B) Immediate corticosteroids** | Contraindicated without tissue diagnosis, especially in a TB-endemic region |
| **D) PFT and 6MWT** | Useful for baseline functional assessment but secondary to establishing the diagnosis |

## Management Algorithm for Suspected Sarcoidosis

```
Suspected Sarcoidosis
        ↓
Tissue biopsy (EBUS-TBNA) → Non-caseating granulomas confirmed
        ↓
Metabolic screening (serum Ca²⁺, 24-h urinary Ca²⁺, renal function)
        ↓
Organ involvement assessment (PFT, DLCO, ECG, ophthalmology)
        ↓
Treatment decision (corticosteroids if symptomatic/progressive)
```

**Key Point:** The correct sequence is: **(1) Confirm diagnosis histologically → (2) Screen for metabolic complications → (3) Assess organ involvement → (4) Initiate therapy.** EBUS-TBNA is the most appropriate immediate next step.

## Additional Investigations After Diagnosis

| Investigation | Purpose | Timing |
|---|---|---|
| EBUS-TBNA | Histological confirmation | **Immediate (next step)** |
| Serum calcium, 24-h urine calcium | Hypercalcemia/hypercalciuria screening | After diagnosis confirmed |
| PFT with DLCO | Assess pulmonary function | After diagnosis confirmed |
| Ophthalmology referral | Uveitis screening | Before steroids |
| Cardiac imaging (ECG, echo) | Exclude cardiac sarcoidosis | If symptoms warrant |

Answer

A. Pulmonary function testing and 6-minute walk test

Answer

C. Serum calcium and 24-hour urinary calcium estimation

Answer

D. Immediate initiation of oral corticosteroids

Explanation

Clinical Context: Suspected Sarcoidosis — Need for Tissue Diagnosis

Why EBUS-TBNA is the Most Appropriate Next Step?

Why Other Options Are Incorrect?

Management Algorithm for Suspected Sarcoidosis

Additional Investigations After Diagnosis

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Option	Reasoning
A) Serum/urinary calcium	Important safety screening, but comes AFTER diagnosis is confirmed — not the immediate next step before tissue biopsy
B) Immediate corticosteroids	Contraindicated without tissue diagnosis, especially in a TB-endemic region
D) PFT and 6MWT	Useful for baseline functional assessment but secondary to establishing the diagnosis

Investigation	Purpose	Timing
EBUS-TBNA	Histological confirmation	Immediate (next step)
Serum calcium, 24-h urine calcium	Hypercalcemia/hypercalciuria screening	After diagnosis confirmed
PFT with DLCO	Assess pulmonary function	After diagnosis confirmed
Ophthalmology referral	Uveitis screening	Before steroids
Cardiac imaging (ECG, echo)	Exclude cardiac sarcoidosis	If symptoms warrant