Lymphoma presenting as a Sister Mary Joseph's nodule.

Metastatic tumors to the umbilicus, often referred to as Sister Mary Joseph's nodules, are rare. In general, they have been described in association with intra-abdominal malignancy, especially adenocarcinomas, although there has been one case report of malignant myeloma spreading to the umbilicus. Lymphomas, however, historically seem to reject the umbilicus as a site of metastatic spread. The following case report is, to our knowledge, the first reported instance of lymphoma presenting as an umbilical nodule.