Question

Carcinoma of the breast is least commonly seen in which quadrant?

• A. Superior outer quadrant
• B. Inferior outer quadrant
• C. Subareolar region
• D. Lower inner quadrant

Hint:

Think about which quadrant holds the smallest amount of glandular breast tissue.

Answer 1

The Correct Option is D

Step 1: Breast cancer distribution follows the amount of breast tissue present in each quadrant. The upper and outer parts of the breast carry the most glandular tissue, so most tumours arise there.

Step 2: The classic frequency distribution is: upper outer quadrant about 50 percent, central or subareolar region about 20 percent, upper inner quadrant about 12 to 15 percent, lower outer quadrant about 6 to 10 percent, and lower inner quadrant only about 3 to 5 percent.

Step 3: Since the lower inner quadrant has the smallest share of breast tissue, it shows the lowest incidence of carcinoma. This makes the lower inner quadrant the correct answer.

Step 4: The superior outer quadrant (option a) is in fact the most common site, and the subareolar and inferior outer quadrants both carry higher percentages than the lower inner quadrant, so they are incorrect.