“…Various classifications have been proposed for lymphangioma: (a) Landing and Farber classified LM into lymphangioma simplex, cavernous lymphangioma, and cystic lymphangioma/hygroma [ 5 ]; (b) based on the depth and size of abnormal lymphatic vessels, LM can be classified into superficial (lymphangioma circumscriptum) and deep (cavernous lymphangioma and cystic hygromas); (c) based on the onset, LM is divided into congenital (more common) and acquired; (d) based on the spread into anatomical spaces in the head and neck region [ 6 ], cystic hygroma can be divided into class/grade I - unilateral infrahyoid, class/grade II - unilateral suprahyoid, class/grade III - unilateral infra and suprahyoid, class/grade IV - bilateral suprahyoid and class/grade V - bilateral infra and suprahyoid [ 7 ]; (e) recently, ISSVA classifies LM into common (cystic) LM (macrocystic LM, microcystic LM, and mixed cystic LM), generalized lymphatic anomaly (GLA), Gorham-Stout disease, channel type LM, and "acquired" progressive lymphatic anomaly [ 2 ].…”