A 50-year-old man dies of a respiratory illness that had been characterized by dyspnea, cough, and wheezing expiration of many years’ duration. Initially episodic, his “attacks” had increased in frequency and at the time of death had become continuous and intractable. At autopsy, which of the following is the most likely histologic finding in the lungs?
**Core Concept**
Chronic obstructive pulmonary disease (COPD) is a progressive lung disease characterized by airflow limitation due to airway inflammation, bronchospasm, and destruction of lung parenchyma. The disease is primarily caused by long-term exposure to noxious particles such as cigarette smoke.
**Why the Correct Answer is Right**
The correct answer is associated with the pathophysiology of COPD, which involves chronic inflammation and destruction of lung tissue. The disease is characterized by the presence of emphysematous changes, such as the loss of alveolar walls and the formation of bullae, which lead to a reduction in lung function. The destruction of lung tissue and airway inflammation result in the loss of elastic recoil and the inability to fully exhale, leading to the characteristic wheezing expiration and dyspnea of COPD patients. The histologic hallmark of COPD is the presence of centriacinar emphysema, which is characterized by the destruction of the distal airspaces and the loss of alveolar walls.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it refers to pulmonary edema, which is a condition characterized by the accumulation of fluid in the alveoli, often due to heart failure or other cardiac conditions. While pulmonary edema can cause respiratory distress, it is not a hallmark of COPD.
**Option B:** This option is incorrect because it refers to pulmonary fibrosis, which is a condition characterized by the scarring of lung tissue, often due to chronic inflammation or exposure to toxins. While pulmonary fibrosis can cause respiratory distress, it is not a hallmark of COPD.
**Option C:** This option is incorrect because it refers to bronchiectasis, which is a condition characterized by the dilatation of the bronchi and bronchioles, often due to chronic infection or inflammation. While bronchiectasis can cause respiratory distress, it is not a hallmark of COPD.
**Option D:** This option is incorrect because it refers to a normal lung, which would not be expected in a patient with a long history of respiratory illness.
**Clinical Pearl / High-Yield Fact**
COPD is often referred to as a "lung burn" because it results in the permanent destruction of lung tissue. This destruction can lead to a loss of lung function and a reduction in the patient's quality of life.
**Correct Answer:** C. Centriacinar emphysema.