Case Presentation: A 66-year-old man with a history of stage IIId melanoma, who received 6 cycles of Nivolumab, presented with anorexia and persistent large-volume diarrhea. Initial workup included a non-elevated white blood cell count of 6.9 k/mm3 and a creatinine of 1.6 mg/dL from baseline creatinine of 0.8 mg/dL. CT imaging of the abdomen showed [...]