Which is more likely to communicate with the tracheobronchial tree... pulmonary sequestration or CPAM (congenital pulmonary airway malformations)?
CPAM communicates with the tracheobronchial tree. "Sequestration" by definition is sequestered away from the airways.
Pulmonary sequestration is least likely to affect which lobe?
The right upper lobe. They most often affect posterobasal segments (as in this case).
There is a region of abnormal T2 signal intensity in the right lower lung zone, with an abnormal feeding vessel which arises directly off the aorta. Findings are compatible with a pulmonary sequestration.
There is a prominent cisterna magna or retrocerebellar arachnoid cyst. The brain is grossly normal.
The image has been rotated to put the fetus in typical position. The mother's bladder is above the fetal head in these images.