26th April 2024

A 24-year-old woman presents with a mobile, painless lump in her right breast that she noticed a month ago

A 24-year-old woman presents with a mobile, painless lump in her right breast that she noticed a month ago. The lump has not changed in size since she first noticed it. She has no family history of breast cancer and is otherwise healthy. On examination, the lump is firm, well-circumscribed, and moves easily with palpation. It is located in the upper outer quadrant of the right breast. A mammogram and ultrasound confirm the presence of a solid, non-calcified mass measuring 1.5 cm in diameter.

Which is the most likely diagnosis?