Advanced metastatic gastric adenocarcinoma identified within the placenta: a case report with literature review

We present an extremely rare case of a multiparous women age 32 in her 35th week of gestation who was admitted to our hospital for evaluation of back pain and was incidentally found to have metastatic gastric adenocarcinoma, diagnosed from a routine placental specimen. The coexistence of gastric carcinoma with pregnancy is a rare event, accounting for 0.026% to 0.1% of all pregnancies. To the best of our knowledge, the world literature contains only eight known cases of metastatic gastric cancer to the placenta—the present case is the ninth. An uncommon finding, in this case, was the extensive spread of cancer to bone marrow and leptomeninges.