Pre- and postnatal treatment of a pulmonary sequestration presenting as a unilateral hydrothorax.

We report a case of a neonatal sequestration diagnosed antenatally as a progressive left hydrothorax when ultrasound (US) was done at 30 weeks' gestation for polyhydramnios. Postnatal US and computed tomography failed to demonstrate any lesion; magnetic resonance imaging showed a spherical mass in the left chest adjacent to the left lower lobe. At the age of 4 weeks a thoracotomy was performed and the mass was excised. Pulmonary sequestrations may present with a pleural effusion and polyhydramnios as a part of non-immune hydrops fetalis. In our case hydrops was prevented by insertion of a pleuro-amniotic shunt.