Buenos Aires, Argentina

This 23-year-old patient, G₂P₁, had a routine examination at 16 weeks and 5 days of pregnancy (according to LMP), with the following findings:

• Intrathoracic mass of increased echogenicity containing small cysts,

• Displacement of the heart (to the right thoracic wall), and

• Diaphragmatic inversion towards the abdomen

• Biometry consistent with LMP.

A reexamination at 22 w and 6 days demonstrated a biparietal diameter of 62 mm (24 w) femoral length 35 mm (20 w). There was hydrops and edema and short limbs. The mass was still present and displaced the heart.

Parents didn"t authorized an autopsy, so the nature of the lung mass is unknown but consistent with a Congenital lobar adenomatosis, type III