Aggressive fibromatosis is a rare condition marked by the presence of desmoid tumors. Imatinib is an experimental drug in the treatment of desmoid tumor or aggressive fibromatosis. Desmoid tumours of the breast are rare. The incidence of mammary desmoid tumours is less than 0.2% of primary breast neoplasms. Treatments for desmoid tumors may include surgery, NSAIDS, anti-estrogen medications, radiation therapy and chemotherapy. The following season, a cancerous desmoid tumor was found in Dravecky's pitching arm. The previous season, a cancerous desmoid tumor was found in Dravecky's pitching arm.