**Question:** A 50-year-old chronic smoker presents with C/O hemoptysis and a mass in the wall of the right main bronchus causing tapered narrowing and irregular stenosis. The next CT Scan that you will advise is:

A. Chest X-ray
B. Chest CT Scan
C. Bronchoscopy
D. Bronchofiberscopy

**Correct Answer:** **B. Chest CT Scan**

**Core Concept:**
The correct imaging modality to evaluate this patient's symptoms and findings is essential for diagnosis and planning of management. In this scenario, we are dealing with a mass in the bronchus causing hemoptysis and stenosis.

**Why the Correct Answer is Right:**
1. Chest X-ray (Option A) is a basic radiological investigation but lacks the detailed resolution required to visualize the mass and its precise location accurately. It might not be able to differentiate between a bronchogenic and extra-bronchial cause for the mass.
2. Chest CT Scan (Option B) is a more sensitive and specific test for detecting lung masses, bronchial wall thickening, and stenosis. It can visualize the exact location, size, and extent of the mass, which is crucial for guiding the next steps in management.
3. Bronchoscopy (Option C) is essential for obtaining tissue/biopsy samples to confirm the diagnosis and rule out invasive procedures like bronchial biopsy, which is not required in this scenario.
4. Bronchofiberscopy (Option D) is a more invasive procedure that requires general anesthesia, and the information obtained can be obtained from a CT scan without the need for an invasive procedure.

**Why Each Wrong Option is Incorrect:**
1. Chest X-ray (Option A) lacks the detail and resolution required to accurately diagnose the mass and stenosis.
2. Bronchoscopy (Option C) is essential for obtaining tissue samples but is not required for the initial investigation.
3. Bronchofiberscopy (Option D) is more invasive and requires general anesthesia, while a CT scan can provide the necessary information without invasive procedures.

**Core Concept:**
The correct imaging modality to investigate this patient's symptoms and findings is crucial for diagnosis, treatment planning, and patient care.

**Clinical Pearls:**
A CT scan is the appropriate first-line investigation for a patient with hemoptysis, bronchial wall thickening, and stenosis due to its superior sensitivity and specificity in detecting lung masses and evaluating the airway wall. It provides detailed information about the mass size, location, and extent of airway obstruction, which helps guide the next steps in management.