Cystic Hygroma

“Bilateral symmetrical cystic structures located in the occipital-cervical region of the fetal neck. They are differentiated from nuchal edema by the presence of the nuchal ligament (midline septum).

Cystic hygroma is caused by defects in the formation of the neck lymphatics. It is the most common form of lymphangioma (75% are located on the neck, 20% in the axillary region and 5% on the chest wall, abdominal wall and extremities).” [Source]

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