Melanotic schwannoma mimicking metastatic pigmented melanoma: a pitfall in cytological diagnosis Diffuse cutaneous melanosis: rare complication of metastatic melanoma * ScienceOpen Understanding Melanoma: Treatment Options for Stage IV Melanoma Diffuse melanosis cutis: a rare manifestation of metastatic melanoma BMJ Case Reports Pigmented Lesions of the Central Nervous System: Radiologic Pathologic CorrelationRadioGraphics 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