Regarding cystic disease of breast which one is true -

• Occur most commonly in the last decade of reproductive life as a result of a non-integrated involution of stroma and epithelium. Clinical Features • Often multiple, may be bilateral and can mimic malignancy. • Typically present suddenly and cause great alarm; prompt diagnosis and drainage provides immediate relief. Diagnosis • Diagnosis can be confirmed by aspiration and/or ultrasound. Treatment • Aspiration for Solitary cyst: If they resolve completely, and if the fl uid is not blood-stained, no further treatment is required (30% will recur and require reaspiration)  • Core biopsy or local excision: If there is a residual lump or if the fl uid is blood-stained, for histological diagnosis (exclude cystadenocarcinoma, which is more common in elderly women)