DDs MRI even after she was born didn't show CCAM conclusively, it showed patterns which could be CCAM, but it was only her lung biopsy which they said would be definitive. Only saying this because I was surprised that an MRI in utero is being done if they couldn't get clear answers from one on a born child, so it may possibly be another piece of the puzzle situation rather than a definite answer. They even waited to do the MRI until a new one was purchased and installed at a hospital 50 miles away, as the existing ones in the local area took them at a standard resolution and the new one in the specialist heart-lung centre would have a greater resolution.