A patient is described with blue, translucent masses of the umbilicus, which were shown to be cyst-like collections of the mucin of pseudomyxoma peritonei. The intraperitoneal condition presented in a superficial, clinically apparent position in this patient because of an umbilical hernia.
Richardson DR, Caravati CM, Wood BT. Bluish Translucent Umbilical Lesions of Pseudomyxoma Peritonei. Arch Dermatol. 1967;96(4):462-463. doi:10.1001/archderm.1967.01610040112021