Malignant acanthosis nigricans in rectal adenocarcinoma.

A case of generalized malignant acanthosis nigricans is reported. The patient was asymptomatic of any gastrointestinal complaints and investigations revealed the presence of adenocarcinoma of the rectum. The association between paraneoplastic acanthosis nigricans and internal malignancy is well established and the most common association is with adenocarcinoma of gastrointestinal origin.