Abnormality of the lymphatic system Lymphangioma 2011-06-07T10:41:13Z UMLS:C0024221 HP:0100764 SNOMEDCT_US:253057002 Lymphangiomas are rare congenital malformations consisting of focal proliferations of well-differentiated lymphatic tissue in multi cystic or sponge like structures. Lymphangioma is usually asymptomatic due to its soft consistency but compression of adjacent structures can be seen due to the mass effect of a large tumor. SNOMEDCT_US:254836000 SNOMEDCT_US:69044001 NCIT:C8965 SNOMEDCT_US:400178008