Metastasis to the umbilicus: possible racial difference.
Umbilical metastasis is rare. A review of the available American literature suggests that it is relatively more common in blacks than in whites. Prospective research is indicated, as this would add to knowledge of cutaneous-reaction patterns peculiar to racial groups.
D000008:Abdominal Neoplasms / Q000556:secondary*; D044383:Black People; D006801:Humans; D012878:Skin Neoplasms / Q000556:secondary*; D014472:Umbilicus