PT - JOURNAL ARTICLE AU - Chanyang Lee AU - Nathalie Falkner AU - Roshanak Kamyab AU - Ran Li TI - Primary angiosarcoma of the breast in an early adolescent female AID - 10.1136/bcr-2022-254283 DP - 2023 Mar 01 TA - BMJ Case Reports PG - e254283 VI - 16 IP - 3 4099 - http://casereports.bmj.com/content/16/3/e254283.short 4100 - http://casereports.bmj.com/content/16/3/e254283.full SO - BMJ Case Reports2023 Mar 01; 16 AB - Primary angiosarcoma of the breast is a rare and aggressive malignancy, which arises from endothelial cells lining blood vessels. It represents less than 0.05% of all breast cancers, and more commonly affects relatively younger individuals. Reaching the correct diagnosis may be delayed, because imaging is not typical of other breast malignancies and can mimic benign processes. Clinical presentation is variable, ranging from diffuse breast oedema to a palpable discrete mass. An early adolescent female presented to her general practitioner with a palpable breast lump on self-examination. The diagnosis of primary breast angiosarcoma was confirmed on biopsy. She underwent a complete surgical resection and adjuvant chemotherapy. She remains in remission after 3 years and is undergoing regular surveillance. Due to the rarity of this condition, there is no established clinical management protocol for this condition currently. Early detection, aggressive treatment and ongoing surveillance provide the best chance of prolonged disease-free survival.