A Case of Primary Melanoma of the Transverse Colon.

Melanoma is among the most prevalent neoplasms diagnosed annually with the vast majority arising from a cutaneous origin. Though there are described metastases to the gastrointestinal tract, there are only rare descriptions of primary gastrointestinal melanoma. Both diagnosis and management of this unique population can be challenging given the infrequency with which it occurs. To follow is the third reported case of transverse colon primary melanoma with a description of multimodality treatment with surgery, chemotherapy, and immunotherapy.