Lymphangiomas are malformations of the lymphatic system characterized by lesions that are thin-walled cysts; these cysts can be macroscopic, as in a cystic ...LymphangiomaFromWikipedia,thefreeencyclopediaJumptonavigationJumptosearchMalformationsofthelymphaticsystemcharacterizedbylesionsthatarethin-walledcystsNottobeconfusedwithLymphohemangioma.MedicalconditionLymphangiomaLymphangioma(cystichygroma)SpecialtyOncology Lymphangiomasaremalformationsofthelymphaticsystemcharacterizedbylesionsthatarethin-walledcysts;thesecystscanbemacroscopic,asinacystichygroma,ormicroscopic.[1]Thelymphaticsystemisthenetworkofvesselsresponsibleforreturningtothevenoussystemexcessfluidfromtissuesaswellasthelymphnodesthatfilterthisfluidforsignsofpathogens.Thesemalformationscanoccuratanyageandmayinvolveanypartofthebody,but90%occurinchildrenlessthan2yearsofageandinvolvetheheadandneck.Thesemalformationsareeithercongenitaloracquired.CongenitallymphangiomasareoftenassociatedwithchromosomalabnormalitiessuchasTurnersyndrome,althoughtheycanalsoexistinisolation.Lymphangiomasarecommonlydiagnosedbeforebirthusingfetalultrasonography.Acquiredlymphangiomasmayresultfromtrauma,inflammation,orlymphaticobstruction.Mostlymphangiomasarebenignlesionsthatresultonlyinasoft,slow-growing,"doughy"mass.Sincetheyhavenochanceofbecomingmalignant,lymphangiomasareusuallytreatedforcosmeticreasonsonly.Rarely,impingementuponcriticalorgansmayresultincomplications,suchasrespiratorydistresswhenalymphangiomacompressestheairway.Treatmentincludesaspiration,surgicalexcision,laserandradiofrequencyablation,andsclerotherapy.Contents1Signsandsymptoms2Causes3Pathophysiology4Diagnosis4.1Classification5Treatment5.1Sirolimus6Prognosis7Epidemiology8History9References10ExternallinksSignsandsymptoms[edit]Therearethreedistincttypesoflymphangioma,eachwiththeirownsymptoms.Theyaredistinguishedbythedepthandthesizeofabnormallymphvessels,butallinvolveamalformationofthelymphicsystem.Lymphangiomacircumscriptumcanbefoundontheskin'ssurface,andtheothertwoty