A cystic hygroma is a malformation of the lymphatic system that results in a cyst filled with lymphatic fluid. It is most commonly a congenital abnormality and is typically located in the posterior triangle of the neck on the leftside.
It may be seen on antenatal scans, picked up on routine baby checks or discovered later when noticed incidentally.
Cystic hygromas most commonly present in the neck or armpit. They:
Treatment varies based on the size, location and complications. Watching and waiting can be appropriate as it is a benign condition. They do not resolve spontaneously, but can show some regression.
Aspiration (giving temporary improvement), surgical removal and sclerotherapy are treatment options.
Depending on the location and size, cystic hygromas can interfere with feeding, swallowing or breathing. It can become infected, in which case it will turn red, hot and tender. There can be haemorrhage into the cyst.