This 12-week fetus shows a well-known anomaly. What’s your diagnosis?

This fetus shows well-defined subcutaneous cystic areas along the posterior aspect of the neck and along the sides of the neck. A few septations are also present within the cystic lesions. This is characteristic of cystic hygroma, which is essentially a congenital lymphangioma. The presence of a large amount of fluid and septations, as in this case, has a very poor prognosis.

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Challenge your diagnostic skills: Can you identify this well-known anomaly?