Most commonly this tumour is due to carcinoma of

Transperitoneal implantation of the carcinoma of the stomach may occur in which the carcinoma cells pass from, stomach into the peritoneal cavity; they "gravitate" into the pelvis where the secondaries palpable on rectal examination I may develop. In females, occasionally, they "alight" upon the ovaries giving rise to Krukenberg tumors which are I liable to produce diagnostic confusion. The term Krukenberg tumor is classically reserved" for metastatic involvement of the ovary by a gastrointestinal tumor. The microscopic appearance of Krukenberg tumors shows characteristic mucin-containing signet-ring cells. This term is often used loosely to describe the metastatic involvement of the ovaries in general. These metastatic lesions often present clinically as primary ovarian lesions and may have a similar radiographic appearance to primary carcinoma of the ovary.