Ma Alison C, Bacon Beatrice R, Danziger Iris, Carr Michele M
Otolaryngology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, USA.
Cureus. 2023 Mar 28;15(3):e36829. doi: 10.7759/cureus.36829. eCollection 2023 Mar.
First branchial cleft cysts (FBCCs) arise due to an incomplete fusion of the cleft between the first and second branchial arches. Classically, they are found inferior to the pinna or along the external auditory canal. This report presents a unique case of a nine-month-old male with a first branchial cleft cyst completely within the pinna. The patient presented with a left auricular pit and pinna mass. Ultrasound revealed a homogeneous hypoechoic mass isolated to the pinna. Surgical resection revealed the cyst to be anterior to the inferior pinna cartilage, with the tract projecting anteriorly and inferiorly. Final pathology revealed a benign cyst lined by squamous epithelium and a rim of cartilage, confirming an FBCC. To our knowledge, FBCCs isolated to the pinna have not been previously reported. Awareness of the various presentations of this rare anomaly is essential for a prompt and accurate diagnosis.
第一鳃裂囊肿（FBCCs）是由于第一和第二鳃弓之间的鳃裂不完全融合而产生的。典型情况下，它们位于耳廓下方或沿外耳道分布。本报告介绍了一例独特病例，一名9个月大的男性，其第一鳃裂囊肿完全位于耳廓内。患者表现为左耳廓凹陷和耳廓肿块。超声显示耳廓内有一个均匀的低回声肿块。手术切除显示囊肿位于耳廓下软骨前方，瘘管向前下方延伸。最终病理显示囊肿为良性，内衬鳞状上皮并有一圈软骨，确诊为FBCC。据我们所知，此前尚未有孤立于耳廓的FBCCs的报道。了解这种罕见异常的各种表现形式对于及时准确的诊断至关重要。
