What is a common feature associated with cystic hygromas?

A cystic hygroma is characterized by the presence of fluid-filled sacs. These lesions are typically located in the neck or axillary area and are derived from the lymphatic system, leading to an abnormal accumulation of lymphatic fluid. The fluid-filled nature of a cystic hygroma is essential in distinguishing it from solid tumors, which do not contain liquids.

The condition is predominantly identified through prenatal ultrasounds and can be seen in fetuses. It may not always necessitate surgical removal as some cases may resolve spontaneously or may not cause significant issues. Additionally, cystic hygromas can be present at birth; they do not solely arise after birth. This highlights the significance of the fluid-filled characteristic in understanding and recognizing cystic hygromas effectively.