AAPC Certified Professional Coder (CPC) — Question 49

The mediastinum is:

Answer options

• A. A location in the chest, bounded by the sternum, diaphragm, and lungs
• B. A small endocrine organ behind the heart
• C. A part of the lymphatic system
• D. Both the heart and lungs

Correct answer: A

Explanation

The correct answer is A because the mediastinum is indeed the region in the chest that is enclosed by the sternum, diaphragm, and lungs. Option B is incorrect as it describes the thymus, which is an endocrine organ, while option C misrepresents the mediastinum, as it is not part of the lymphatic system. Option D is also incorrect because the mediastinum is not defined as both the heart and lungs.