Which diagnostic test is the best initial evaluation for a breast mass in a woman under 40?

Which diagnostic test is the best initial evaluation for a breast mass in a woman under 40?

• A. Mammography
• B. Ultrasound
• C. MRI
• D. CT scan

Answer: (B)

Ultrasound is the best initial evaluation for a breast mass in a woman under 40 because younger breasts are usually dense, which reduces mammography’s sensitivity. Sound-wave imaging can quickly distinguish cystic from solid lesions, describe borders and internal characteristics, and assess features that help sort benign from suspicious masses. It’s also useful for guiding biopsies or aspirations and has no radiation exposure, making it ideal as a first-line study in this age group. If ultrasound findings are indeterminate or if a lesion is solid and suspicious, additional imaging like mammography or MRI can be pursued, but the initial step is ultrasound.

Ultrasound is the best initial evaluation for a breast mass in a woman under 40 because younger breasts are usually dense, which reduces mammography’s sensitivity. Sound-wave imaging can quickly distinguish cystic from solid lesions, describe borders and internal characteristics, and assess features that help sort benign from suspicious masses. It’s also useful for guiding biopsies or aspirations and has no radiation exposure, making it ideal as a first-line study in this age group. If ultrasound findings are indeterminate or if a lesion is solid and suspicious, additional imaging like mammography or MRI can be pursued, but the initial step is ultrasound.