**Question:** A 30-year-old man presents with coughing up blood and sputum. There is no associated dyspnea, fever, or pleuritic chest pain. His past medical history is significant for recurrent pneumonias and a chronic cough productive of foul-smelling purulent sputum. The sputum production is usually worse when lying down and in the morning. He quit smoking 5 years ago and started when he was 18 years old. On physical examination, he appears chronically ill with clubbing of the fingers. Wet inspiratory crackles are heard at the lung bases posteriorly. CXR shows scarring in the right lower lobe, which on chest CT scan is identified as airway dilatation, bronchial wall thickening, and grapelike cysts. Which of the following is the most likely diagnosis? (See Figure below)

A. Chronic bronchitis
B. Bronchiectasis
C. Pneumonia
D. Tuberculosis

**Correct Answer:** B. Bronchiectasis

**Core Concept:** Bronchiectasis is a condition characterized by irreversible dilation of the bronchi, leading to impaired mucociliary clearance and recurrent infections. It is often caused by chronic bronchial obstruction or inflammation, leading to bronchial dilation and wall thickening.

**Why the Correct Answer is Right:**

The correct answer, bronchiectasis (option B), is chosen because of the following observations:

1. The patient has a history of recurrent pneumonias, which is a hallmark feature of bronchiectasis.
2. The clinical findings of clubbing, wet inspiratory crackles at lung bases, and grapelike cysts on chest CT scan are consistent with bronchiectasis.
3. The patient has a history of smoking, which is a recognized risk factor for bronchiectasis.
4. The patient's symptoms (coughing up blood, productive cough, and worsening of symptoms when lying down) are all consistent with bronchiectasis.

**Why Other Options are Incorrect:**

1. Chronic bronchitis (option A) is not characterized by the presence of grapelike cysts on CT scan and is typically associated with smoking.
2. Pneumonia (option C) presents with fever, chills, and localized inflammation associated with the affected area, unlike the patient's systemic symptoms and signs.
3. Tuberculosis (option D) typically presents with fever, night sweats, weight loss, and systemic symptoms, which are not present in this case.

**Clinical Pearls:**

1. Clubbing is a clinical sign of chronic bronchopneumonia and is associated with underlying lung disease, often due to chronic bronchial obstruction or inflammation.
2. Wet inspiratory crackles are heard in patients with bronchiectasis and are caused by airway obstruction or obstruction, which leads to increased bronchial secretions and mucus plugging.
3. Grapelike cysts on CT scan are indicative of bronchiectasis, which is characterized by bronchial dilation and wall thickening due to chronic bronchial obstruction or inflammation.