True about leimyosarcoma breast

.LEIOMYOSARCOMA * It arises from smooth muscle. Cut section shows whorled appearance. * It is undetermined grade. * It is common in retroperitoneum and viscera, but can occur in limbs and skin. * Recurrence is common. It has got poor prognosis. * It can occur in the piloerector muscle of skin; inferior vena cava; pulmonary aery. * Desmin and actin are the most common immunohistochemical stains.leiomyosarcoma of breast is a well encapsulated tumour. ref:SRB&;s manual of surgery,ed 3,pg no 268