26th April 2024

A 29-year-old woman presents with a palpable lump in her left breast that she discovered two months ago during a self-examination.

A 29-year-old woman presents with a palpable lump in her left breast that she discovered two months ago during a self-examination. The lump is not painful and has not changed in size. She has no family history of breast cancer. On examination, the lump is firm, round, well-defined, and mobile, measuring about 2.5 cm in diameter. It is located in the upper quadrant of the left breast. A mammogram and ultrasound confirm the presence of a solid, homogeneous mass without calcifications.

Which is the most likely diagnosis?