Metastatic pulmonary adenocarcinoma to placenta and pleural fluid: clinicopathologic findings

To report the clinicopathologic findings of a pregnant woman with Stage IV adenocarcinoma of the lung with placental metastasis.

Medical records review.

A 31-year-old G(2)P(1001) woman was diagnosed with Stage IV metastatic adenocarcinoma of the lung. At 34 weeks' and 2 days' gestation, she went into preterm labor and delivered a live male infant, weighing 2595 grams, with Apgar scores of 9 and 9, respectively. Placental pathology was significant for adenocarcinoma with a solid and acinar pattern, consistent with that from the lung. Her postpartum course was uneventful. She did not receive chemotherapy and expired one month postpartum. To date, the infant is without evidence of disease.

The occurance of lung cancer in pregnancy is rare and a few cases have been reported in literature. Placental metastasis is extremely uncommon in these cases and can lead to fetal involvement by lung tumor. It is important to report all cases of lung cancer occurring in pregnancy with subsequent close clinical surveillance of the infant as all cases have a different clinical picture.