Magnetic resonance imaging appearances in primary and secondary angiosarcoma of the breast

Angiosarcomas are malignant tumours of endovascular origin. They are rare tumours accounting for 0.04–1% of all breast malignancies. Two different forms are described: primary, occurring in young women, and secondary angiosarcoma, which occurs in older women with a history of breast‐conserving surgery and radiation therapy. Imaging findings on mammography and ultrasound are non‐specific, but magnetic resonance imaging with dynamic contrast enhancement is more informative. We present two cases – one of primary and one of secondary angiosarcoma – and review the imaging findings.