Benign breast tumor with fibrous and glandular tissue.

Etiology: unknown, but a hormonal relationship has been established (growth may occur in parallel to increasing estrogen, e.g., during pregnancy or before menstruation)

Epidemiology:- The leading cause of breast tumor in women < 35 years of age- Peak incidence: 15-35 years

Clinical features: - Mostly solitary, well-defined, non-tender, rubbery and mobile mass

Diagnosis:- Ultrasound: well-defined mass- Mammogram: well-defined mass with possibly popcorn-like calcifications- If imaging is inconclusive: fine-needle aspiration showing fibrous and glandular tissue

Treatment: regular check-ups