（原文GaurangShah）建议多朗读英文并口译，小编翻译供参考，愿为您的放射之路锦上添花

A9-month-oldpresentswithrespiratorytractinfectionandrecurrentpreauricularswelling

9个月大婴儿，表现为呼吸道感染和复发性耳前肿胀。

A

B

(A,B)PostcontrastaxialCTexhibitsaroundedlowattenuatingmassatthesuperficiallobeoftheparotidglandwithperipheralringenhancement(blackarrow).Thereismildpatchyenhancementoftheswollenleftparotidgland(blackarrow).

(A，B)增强后轴位CT显示腮腺浅叶圆形低密度肿块，环状强化(黑色箭头)。左侧腮腺肿胀，轻度斑片状强化(黑色箭头)。

DifferentialDiagnosis

?Infectedfirstbranchialcleftcyst:Ovoid,well-marginatedcysticmassinaninfantorchildisseenwithintheparotidglandwithperipheralpostcontrastenhancementandinflammatorychangeswithintheparotidgland.

?Suppurativeintraparotidlymphnode:Well-marginated,ovoidcysticmasswithintheparotidgland.Ifsingle,itisdifficulttodifferentiatefrominfectedfirstbranchialcleftcyst.

?Lymphaticmalformation:Alsoknownascystichygroma,thisappearsasamultilocularmasswithserpiginous,tubular,cysticchannels.Italsoinvolvesotherneckspaces,rarelyonlytheparotidspaceandrarelysingle.

鉴别诊断

?第一鳃裂囊肿感染：婴儿或儿童，腮腺内可见卵圆形、边界尚清的囊性肿块，增强后周围强化，腮腺内有炎性改变。

?腮腺内化脓性淋巴结：腮腺内边界清楚、卵圆形的囊性肿块。如果是单发，很难与感染的第一鳃裂囊肿相鉴别。

?淋巴管畸形：也称为囊性水瘤，表现为具有锯齿状、管状、囊性通道的多房性肿块。也累及其他颈部间隙，很少只累及腮腺间隙，也很少单发。

EssentialFacts

?Causedbypersistenceoffirstbranchialapparatus,isrelativelyrare,andaccountsfor8to10%ofbranchialcleftanomalies.Itismore