9Piura B. Umbilical metastasis: Sister Mary Joseph's nodule [J]. Harefuah, 2006, 145(7): 505-509.
10Yendluri V, Centeno B, Springett GM. Pancreatic cancer presenting as a Sister Mary Joseph's nodule: case report and update of the literature[J]. Pancreas, 2007, 34(1): 161-164.