Krukenberg tumor as an incidental finding in a full-term pregnancy: a case report

BACKGROUND: Krukenberg tumor is a rare metastatic tumor of the ovary with histopathological features known as signet ring cells. It usually develops in women around 45 years of age. However, here we describe an uncommon case in a 38-year-old pregnant woman. We report this case due to our unusual findings, the uncommon presentation in this younger age bracket, its diagnostic challenge, and poor prognosis. CASE PRESENTATION: We describe a unique case of a young Mexican woman with a history of painful vaginal bleeding at 13 weeks of pregnancy and treated for abruptio placentae. In her routine prenatal visit at week 20 of pregnancy, she was found to have a uterine fundus exceeding the expected measure for her gestational age and was referred to the hospital to discard polyhydramnios. Upon admission, a pelvic ultrasound was performed displaying normal findings in a 25-week pregnancy, and also showing bilateral enlarged ovaries with heterogeneous echogenicity. Magnetic resonance imaging revealed a left tumoral lesion with dimensions of 22.1 × 13.6 × 16.3 cm presenting regular lobulated contours with displacement of peripheral structures and mild compression of the bladder, the left ureter, and the inferior vena cava. The lesion was heterogeneous with irregular borders. The patient was scheduled for a cesarean section; during the operation, the abdominal cavity showed bilateral tumors compatible with MRI findings. The ovarian tumors were sent to pathology, and the results showed poorly differentiated mucinous adenocarcinoma (World Health Organization grade III) with extensive signet ring cells, indicative of a Krukenberg tumor. CONCLUSION: This case report describes an uncommon example of a young pregnant woman without identifiable risk factors for gastric cancer who manifested a Krukenberg tumor. This incidental finding suggests that pregnancy obscured the cancer’s clinical appearance. The rapid deterioration in the patient’s condition corresponds to what is described in the literature. The limited information regarding this neoplasm in Mexico and the torpid evolution of the case highlight the importance of conducting additional studies to generate therapeutic interventions aimed at increasing overall survival.