<prompt> Brilliantly translucent swelling in the neck region in a 2 years child. Diagnosis isLipomaTeratomaCystic hygromaThyroglossal cyst  <response>: C. i.e. Cystic hygroma 729 B L 25th 625-S. Das 5thCYSTIC HYGROMA - swelling consists of aggregation of cysts which contain clear lymph multilocular.Each locule is lined by a single layer of endothelium that is why this swelling is a Brilliantly Translucent swelling Sequestration of a portion of the jugular lymph sac from the lymphatic system accounts for the appearance of these swelling Benign multilobular, multinodular cystic masses lined by a endothelial cells mosaic appearance Posterior triangle of the neck is commonest site Soft, fluctuation test is positive, impulse on coughing presents regional lyrnphnode are not enlarged Excision is the treatment of choice and sclerotherapy with picibanil OK- 432 