A 32-year-old woman, gravida 0 para 0, comes to the office after noticing a painful breast lump in the right breast on self-examination. The patient did notice that the lump becomes larger and tender closer to
menstruation, and it often self-resolves once the period has ended. Medical history is unremarkable, she takes no medication, and she has not had any recent trauma. Family history is positive for
breast cancer in her mother at age 60. Vitals are within normal limits. On physical examination, a nodular lump is present in the upper outer quadrant of the right breast accompanied by diffuse tenderness. No discharge is expressible from either
nipple. No
lymphadenopathy is noted. Which of the following is the most likely diagnosis?
