Multiplanar and multisequence fetal MRI confirmed a well-circumscribed, non-infiltrating, anterior cervicothoracic mass lesion measuring at least 4.6 - 4.8 cm in craniocaudal length, 5.4 cm in width and 5.8cm in the oblique anteroposterior diameter. The mass is eccentric towards the right with extension left and right of the central anterosuperior thorax. The mass is subcutaneous and superficial. It has a mild increased T2 signal intensity and isointense to low T1 signal intensity with a macrocystic and multilocular appearance. There is no intralesional haemorrhage, no flow voids are present and no obvious features to suggest calcification. Intralesional septae are appreciated.There is no intramediastinal extension. The visualised airway appeared patent and non-compromised. The visualised lungs, heart and mediastinum appear normal.
Fetal brain maturation, gyration and sulcation are age appropriate. The rest of the examination appeared normal.