Brain metastasis in basaloid undifferentiated anal carcinoma: A case report.

Anal cancer is a rare tumor that accounts for 2% of all colorectal neoplasms. The brain is a rarely affected organ. The aim of the present study was to the review the only four cases of anal cancer brain metastases previously published in the literature. In addition, the current study presents the case of a 69-year-old male diagnosed with basaloid undifferentiated carcinoma of the anal canal (stage IV with liver, lung and bone metastasis). Despite the patient's good response to chemotherapy and the achievement of a partial response that was maintained for 14 months, brain metastases developed. Although radiotherapy was administered, the patient succumbed to the condition 12 weeks after the diagnosis of brain metastasis.