Pregnancy complicated by a Krukenberg tumor with an undetermined origin and its management.

Krukenberg tumor in pregnancy is very rare and management of this condition is a dilemma for physicians. Moreover, the existence of a primary Krukenberg tumor is still in debate. Herein, we present a 29-year-old woman at 29 weeks of pregnancy, admitted with premature labor and revealed to have a signet ring cell ovarian tumor with an undetermined primary origin. A primary Krukenberg tumor or a Krukenberg tumor with an undetermined origin has not been previously reported in a pregnant patient. By virtue of the controversy, we are not eager to use the term 'primary Krukenberg tumor' for this case, although the possibility of the existence of this kind of tumor cannot be totally ignored.