Abnormal fetal pulmonary morphology Prenatal flattened diaphragm 2024-02-20T09:54:55Z The diaphragm normally projects up into the thoracic cavity. In the presence of malformations such as enlarged lungs, the diaphragm may appear abnormally flat or even everted (with the middle of the diaphragm projecting downwards into the abdominal cavity). Serr Figures 1 and 2 of PMID:30319217.