Melanosis Coli: A Case of Mistaken IdentityA Case Report The Permanente Journal Benign Discoloration Poses Questions Benign Discoloration Poses Questions MELANOSIS COLI** Melanosis coli is a disorder of pigmentation of the bowel wall. Histology demonstrates pigment laden macrophages It is associated with laxative abuse, especially **anthraquinone compounds such as senna** An unusually pigmented colon The Lancet Gastroenterology & Hepatology