Final answer:
Fibroadenoma is the most common breast mass in women 40-50 years old. Diagnostic tests like mammogram, ultrasound, and biopsy are used to evaluate and diagnose breast masses.
Step-by-step explanation:
The most common breast mass in women 40-50 years old is fibroadenoma.
Fibroadenomas are benign tumors that are composed of both glandular and fibrous tissues.
They are typically smooth, round, and firm to the touch and can often be easily moved within the breast.
Screening mammogram, ultrasound (u/s), and aspiration are commonly used diagnostic tests to evaluate breast masses.
If a mass appears complex on ultrasound, a core-needle biopsy may be recommended to further investigate.