Alveolar soft part sarcoma with breast metastases: a case report.

Alveolar soft part sarcoma (ASPS) is a rare mesenchymal tumor, accounting for <1 % of all soft tissue sarcomas. It appears mainly in young adults, has a female predominance and follows an indolent natural history. Like other sarcomas, it can metastasize to the lungs, liver, bones and the brain, but unusual sites have also been described, including the vagina, the orbit, colonic mucosa and the breast. This paper presents a case report of a 31-year-old patient with metastatic ASPS, who developed two highly vascular breast nodules that following an excisional biopsy, were shown to represent metastases from the patient's known sarcoma.