A hygroma is a thin-walled cystic tumor containing lymph and lined with endothelium. It occurs most commonly in the side of the neck in the lower half. Occasionally it extends into the mediastinum. These tumors are usually made up of several cysts and are then described as lobulated. Capillary and cavernous types, however, occur in children. Hygromas also have been found in the axilla and groin, but these are rare. Hygromas of the neck appear most frequently during the first two years of life, but they may develop at any time. They grow rapidly.
Dowd1 collected reports of ninety-one cases in 1913. Only seven of these were in adults, whose ages ranged from 19 to 37 years. Vaughn2 in 1934 reviewed all cases recorded in the literature since 1913. They numbered sixty-four cases. Only ten of these were in adults, whose ages ranged from 18 to 36 years.
FLEMING BL. CYSTIC HYGROMA OF THE NECK. JAMA. 1938;110(23):1899–1900. doi:10.1001/jama.1938.02790230015007
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