A Krukenberg tumor is a rare type of metastatic ovarian tumor that originates from a primary cancer in another part of the body, most commonly the stomach. It is characterized by the presence of mucin-producing signet-ring cells within the ovarian tissue. Krukenberg tumors typically affect both ovaries and are more common in women of reproductive age. Symptoms may include abdominal pain, bloating, or changes in menstrual patterns.