Lung mass due to amniotic fluid embolism--an intrathoracic complication of pregnancy.

A 29-year-old woman with right chest pain was admitted for radiographic investigation and found to have a round mass in the right lower zone. This was initially suspected to be a hydatid lung cyst but was confirmed as a cystic mass by computed tomography and duly excised. Histologic examination revealed an amniotic fluid embolism. The patient had had a stillbirth three months earlier.