A Huge Sister Mary Joseph's Nodule From Signet Ring Cell Gastric Carcinoma Showing Good Response to FOLFOX-Based Chemotherapy Regimen.

Metastatic involvement of the umbilicus as a result of a visceral carcinoma is a rare entity known as Sister Mary Joseph's nodule (SMJN). The most common primary sites are the gastrointestinal and gynecological tract. The occurrence of SMJN is commonly associated with advanced peritoneal disease and poor prognosis.