Wei Liu1, Min Chen1, Bing Liu1, Jie Zhang1, Xin Ni1. 1. Department of Otorhinolaryngology-Head and Neck Surgery, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China.
Abstract
OBJECTIVES/HYPOTHESIS: We aimed to analyze the clinical characteristics and introduce a new subclassification system for type II first branchial cleft anomalies (FBCAs) based on magnetic resonance imaging (MRI) findings. STUDY DESIGN: Retrospective cases study. METHODS: We conducted an analysis of data from patients with type II FBCAs. MRI findings were used to categorize FBCAs into three subtypes. FBCAs located between the subcutaneous tissue and parotid were classified as type IIa. FBCAs located between the deep and superficial lobes of the parotid were classified as type IIb. FBCAs located between the parotid and the carotid sheath were classified as type IIc. RESULTS: Patients with type II FBCAs were classified as type IIa, IIb, and IIc in 14, 14, and seven cases, respectively. Type IIa lesions exhibited a close relationship with the facial nerve in 42.9% of cases. In these cases, the main trunk of the facial nerve adhered to the lesion and was located superficially to the FBCA. In all patients with type IIb lesions, the main trunk and marginal mandibular branch of the facial nerve adhered to the lesion. The main trunk of the facial nerve adhered to the lesion in one patient with a type IIc. There was no relationship between the lesion and the facial nerve in the remaining type IIc cases. CONCLUSIONS: MRI can be used to identify the locations of FBCA and the parotid, which can aid surgeons in predicting the relationship between the lesion and the facial nerve. It is feasible to classify type II FBCAs into three subtypes based on MRI. LEVEL OF EVIDENCE: 4 Laryngoscope, 131:916-920, 2021.
OBJECTIVES/HYPOTHESIS: We aimed to analyze the clinical characteristics and introduce a new subclassification system for type II first branchial cleft anomalies (FBCAs) based on magnetic resonance imaging (MRI) findings. STUDY DESIGN: Retrospective cases study. METHODS: We conducted an analysis of data from patients with type II FBCAs. MRI findings were used to categorize FBCAs into three subtypes. FBCAs located between the subcutaneous tissue and parotid were classified as type IIa. FBCAs located between the deep and superficial lobes of the parotid were classified as type IIb. FBCAs located between the parotid and the carotid sheath were classified as type IIc. RESULTS:Patients with type II FBCAs were classified as type IIa, IIb, and IIc in 14, 14, and seven cases, respectively. Type IIa lesions exhibited a close relationship with the facial nerve in 42.9% of cases. In these cases, the main trunk of the facial nerve adhered to the lesion and was located superficially to the FBCA. In all patients with type IIb lesions, the main trunk and marginal mandibular branch of the facial nerve adhered to the lesion. The main trunk of the facial nerve adhered to the lesion in one patient with a type IIc. There was no relationship between the lesion and the facial nerve in the remaining type IIc cases. CONCLUSIONS: MRI can be used to identify the locations of FBCA and the parotid, which can aid surgeons in predicting the relationship between the lesion and the facial nerve. It is feasible to classify type II FBCAs into three subtypes based on MRI. LEVEL OF EVIDENCE: 4 Laryngoscope, 131:916-920, 2021.