Medullary Colon Cancer Presenting with Total Necrosis of All Regional Lymph Node Metastases: Morphologic Description of a Presumed Immune-mediated Event

Medullary carcinoma is a rare type of colon cancer with characteristic clinical and molecular features. Notably, despite its high-grade histology, the prognosis is generally better than for colonic adenocarcinoma of the usual type. We present herein a singular case of medullary colon cancer in which all of numerous lymph node metastases in the surgical resection specimen were completely necrotic in the face of a wholly viable primary tumor. Possible mechanisms are discussed with emphasis on immune-mediated factors.Virtual Slides: The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/13000_2014_204.