A cystic hygroma is a thin-walled, sac-like structure filled with lymph. It occurs most commonly in the head and neck area and often appears as a soft bulge under the skin.
Causes, incidence, and risk factors
This condition is a congenital (present before birth) abnormality caused by embryonic lymphatic tissues. Cystic hygromas are tumors derived from these tissues.
Expectations (prognosis)
The outlook is good if surgery can totally remove the abnormal tissue. In cases where complete removal is not possible because of involvement of neighboring nerves or blood vessels, recurrence is common.
Complications
Bleeding, infection, recurrence of the cystic hygroma, and damage to structures in the neck caused by surgery.
Calling your health care provider
Call your physician regarding any neck mass found in a child or adult.