Endoscopic findings of different grades and severities of melanosis Download Scientific Diagram Melanosis Coli) Cathartic Colon ICD 10 Coding for Loose Bowel Movements Melanosis coli: a contrast effect or an oncogenic effect? A large scale retrospective cohort study International Journal of Colorectal Disease Springer Nature Link This is a very rare case of metastatic oral mucosal melanoma to the colon with an unusual presentation mimicking melanosis coli. The colonoscopy findings show no mass effect but multiple hyperpigmented lesions