<prompt> Regarding cystic disease of breast which one is true -Common in 25 years of ageExcision is the treatmentmay turn into malignantAspiration is the treatment  <response>: 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 andor 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 