[A case of locally advanced colorectal cancer with abscess responding to 5-fluorouracil, leucovorin, and oxaliplatin plus bevacizumab].

We encountered a case of colorectal cancer with pelvic abscess treated with radical surgery following colostomy and chemotherapy. The patient was a man in his 60s with advanced rectal cancer. The tumor had expanded locally and formed an abscess. We evaluated the primary lesion as unresectable, and performed chemotherapy with 5-fluorouracil, Leucovorin, and oxaliplatin( mFOLFOX) plus bevacizumab after colostomy. After 13 courses of chemotherapy, the tumor shrank remarkably. We performed a low anterior resection followed by adjuvant chemotherapy with capecitabine. The patient has had no recurrence for 18 months after surgery.