Pathology Outlines Nodular melanoma Chasing shadows: A series of tumoral melanosis mimicking melanoma JAAD Case Reports 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 Pathology Outlines Common acquired nevus Subungual Melanocytic Lesions: Key Clinical and Pathologic Concepts and Biopsy Techniques Actas Dermo Sifiliogrficas